diff --git a/Sprint-2/1-key-exercises/1-count.js b/Sprint-2/1-key-exercises/1-count.js
index 117bcb2b6..e32fa2317 100644
--- a/Sprint-2/1-key-exercises/1-count.js
+++ b/Sprint-2/1-key-exercises/1-count.js
@@ -4,3 +4,5 @@ count = count + 1;
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+
+//Updating the value of count by adding 1 to it's current value. = is assigning
diff --git a/Sprint-2/1-key-exercises/2-initials.js b/Sprint-2/1-key-exercises/2-initials.js
index 964c9563c..6b9f1b03c 100644
--- a/Sprint-2/1-key-exercises/2-initials.js
+++ b/Sprint-2/1-key-exercises/2-initials.js
@@ -5,6 +5,8 @@ const lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-const initials = ``;
+const initials =
+  firstName.charAt(0) + middleName.charAt(0) + lastName.charAt(0);
+console.log(initials);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
diff --git a/Sprint-2/1-key-exercises/3-paths.js b/Sprint-2/1-key-exercises/3-paths.js
index ab90ebb28..b0c534dca 100644
--- a/Sprint-2/1-key-exercises/3-paths.js
+++ b/Sprint-2/1-key-exercises/3-paths.js
@@ -17,7 +17,7 @@ console.log(`The base part of ${filePath} is ${base}`);
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0, lastSlashIndex);
+const ext = filePath.slice(filePath.lastIndexOf("."));
 
-// https://www.google.com/search?q=slice+mdn
\ No newline at end of file
+// https://www.google.com/search?q=slice+mdn
diff --git a/Sprint-2/1-key-exercises/4-random.js b/Sprint-2/1-key-exercises/4-random.js
index 292f83aab..abaabf446 100644
--- a/Sprint-2/1-key-exercises/4-random.js
+++ b/Sprint-2/1-key-exercises/4-random.js
@@ -7,3 +7,12 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+//num is a random whole number between 1 and 100 inclusive.
+//math.floor rounds down.
+//math.random gives a random number between 0 and 1. It can be equal to 0, but not equal to 1, and have decimals
+//(maximum - minimum + 1) gives in this case 100
+//So then Math.random() * (maximum - minimum + 1) gives a number between 0 inclusive and 100 exclusive
+//Math.random() * (maximum - minimum + 1) + minimum gives a number between 1 inclusive and 101 exclusive
+//and thus Math.floor(Math.random() * (maximum - minimum + 1)) + minimum; gives a whole rounded
+//down number
diff --git a/Sprint-2/2-mandatory-errors/0.js b/Sprint-2/2-mandatory-errors/0.js
index cf6c5039f..4a6c3df33 100644
--- a/Sprint-2/2-mandatory-errors/0.js
+++ b/Sprint-2/2-mandatory-errors/0.js
@@ -1,2 +1,3 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
\ No newline at end of file
+//This is just an instruction for the first activity - but it is just for human consumption
+//We don't want the computer to run these 2 lines - how can we solve this problem?
+//Make it code
diff --git a/Sprint-2/2-mandatory-errors/1.js b/Sprint-2/2-mandatory-errors/1.js
index 7a43cbea7..fbf2dc0e0 100644
--- a/Sprint-2/2-mandatory-errors/1.js
+++ b/Sprint-2/2-mandatory-errors/1.js
@@ -1,4 +1,9 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+
+//TypeError: Assignment to constant variable.
+//Age is constant so can't be reassigned
+//To fix, change const to let, so line 3 becomes:
+//let age = 33;
diff --git a/Sprint-2/2-mandatory-errors/2.js b/Sprint-2/2-mandatory-errors/2.js
index e09b89831..f84cd6486 100644
--- a/Sprint-2/2-mandatory-errors/2.js
+++ b/Sprint-2/2-mandatory-errors/2.js
@@ -1,5 +1,9 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+//ReferenceError: Cannot access 'cityOfBirth' before initialization
+//Trying to use cityOfBirth before it's defined
+//To fix, put line 5 before line 4, so it is initialised before use
diff --git a/Sprint-2/2-mandatory-errors/3.js b/Sprint-2/2-mandatory-errors/3.js
index ec101884d..a0a00ee75 100644
--- a/Sprint-2/2-mandatory-errors/3.js
+++ b/Sprint-2/2-mandatory-errors/3.js
@@ -1,5 +1,6 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber % 10000;
+console.log(last4Digits);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
@@ -7,3 +8,6 @@ const last4Digits = cardNumber.slice(-4);
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+//TypeError: cardNumber.slice is not a function
+//cardNumber is an integer, and slice is a string method, so slice doesn't work on cardNumber
diff --git a/Sprint-2/2-mandatory-errors/4.js b/Sprint-2/2-mandatory-errors/4.js
index 5f86c730b..0203408ea 100644
--- a/Sprint-2/2-mandatory-errors/4.js
+++ b/Sprint-2/2-mandatory-errors/4.js
@@ -1,2 +1,6 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const HourClockTime12 = "8:53pm";
+const hourClockTime24 = "20:53";
+
+//SyntaxError: Invalid or unexpected token
+//In javascript, variable names cannot start with a number.
+//To fix, either put number at the end or start with _ or use a different name
diff --git a/Sprint-2/3-mandatory-interpret/1-percentage-change.js b/Sprint-2/3-mandatory-interpret/1-percentage-change.js
index e24ecb8e1..9642ee720 100644
--- a/Sprint-2/3-mandatory-interpret/1-percentage-change.js
+++ b/Sprint-2/3-mandatory-interpret/1-percentage-change.js
@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,17 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+//5 function calls. 2 in line 4, 2 in line 5, 1 in line 10
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
+//Error is from line 5, no comma separating arguments for replace all. fix by adding comma after ","
 
 // c) Identify all the lines that are variable reassignment statements
+//4 and 5
 
 // d) Identify all the lines that are variable declarations
+//1, 2, 7, 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//takes the string 10,000 and replaces all the commas with empty string, effectively removing the comma
+//makes the string into number format so it can be converted to a number
diff --git a/Sprint-2/3-mandatory-interpret/2-time-format.js b/Sprint-2/3-mandatory-interpret/2-time-format.js
index 47d239558..a736d22a7 100644
--- a/Sprint-2/3-mandatory-interpret/2-time-format.js
+++ b/Sprint-2/3-mandatory-interpret/2-time-format.js
@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 5; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,25 @@ console.log(result);
 // For the piece of code above, read the code and then answer the following questions
 
 // a) How many variable declarations are there in this program?
+//6
 
 // b) How many function calls are there?
+//1
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+//% is the modulo operator, which gives the remainder after operand.
+//so in this case, the remainder of movieLength/60,
+// the number of seconds not in a whole minute
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//Take the total number of seconds in the move, minus the remainder of movieLength/60 to give
+//a number that divides exactly by 60, then divide that number by 60. it converts the
+// time into minutes
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//The movie length formatted in hours:minutes:seconds. formattedMovieLength
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//It works for positive numbers. negative numbers but will give a negative time which is
+//not real. It works with decimal numbers fine. text will give NaN
diff --git a/Sprint-2/3-mandatory-interpret/3-to-pounds.js b/Sprint-2/3-mandatory-interpret/3-to-pounds.js
index 60c9ace69..883cd2993 100644
--- a/Sprint-2/3-mandatory-interpret/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-interpret/3-to-pounds.js
@@ -2,13 +2,13 @@ const penceString = "399p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
-  penceString.length - 1
+  penceString.length - 1,
 );
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
 const pounds = paddedPenceNumberString.substring(
   0,
-  paddedPenceNumberString.length - 2
+  paddedPenceNumberString.length - 2,
 );
 
 const pence = paddedPenceNumberString
@@ -25,3 +25,32 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// 2. const penceStringWithoutTrailingP = penceString.substring(
+//  0,
+//  penceString.length - 1
+//);
+// finds a substring starting at 0 index to 1 before the last index, and assigns the
+// substring to penceStringWithoutTrailingP. This removes the p and leaves us with just
+// the number
+
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// Makes it so that the string is always at least 3 characters, by adding leading 0 until
+// it is 3 characters long.
+
+// 4. const pounds = paddedPenceNumberString.substring(
+//  0,
+//  paddedPenceNumberString.length - 2,
+//);
+// Finds the substring of number paddedPenceNumberString, with the last 2 digits cut off
+// basically finds the number of pounds by cutting off the pence
+
+// 5. const pence = paddedPenceNumberString
+//  .substring(paddedPenceNumberString.length - 2)
+//  .padEnd(2, "0");
+// Takes the substring starting at the total length-2, to the end. Essentially taking the
+// last 2 digits
+// Then adds 0 to the end so it is at least 2 characters long
+
+//6. console.log(`£${pounds}.${pence}`); prints the pound and pence variable
+// in the format £pounds.pence
diff --git a/Sprint-2/4-stretch-explore/chrome.md b/Sprint-2/4-stretch-explore/chrome.md
index 962580b82..cf4d74457 100644
--- a/Sprint-2/4-stretch-explore/chrome.md
+++ b/Sprint-2/4-stretch-explore/chrome.md
@@ -8,8 +8,12 @@ Let's try an example.
 In the Chrome console, invoke the function `alert` with one argument, the string `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Message window at the top, that takes over the window with the message of the argument
 
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+
+prompt creates a window at the top with a text input box, with the message passed as the argument
+the return value is whatever was written in the box
diff --git a/Sprint-2/4-stretch-explore/objects.md b/Sprint-2/4-stretch-explore/objects.md
index 0216dee56..305ec2e34 100644
--- a/Sprint-2/4-stretch-explore/objects.md
+++ b/Sprint-2/4-stretch-explore/objects.md
@@ -5,12 +5,98 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
+ƒ log() { [native code] }, which is telling me what it is, a function
 
 Now enter just `console` in the Console, what output do you get back?
+assert
+:
+ƒ assert()
+clear
+:
+ƒ clear()
+context
+:
+ƒ context()
+count
+:
+ƒ count()
+countReset
+:
+ƒ countReset()
+createTask
+:
+ƒ createTask()
+debug
+:
+ƒ debug()
+dir
+:
+ƒ dir()
+dirxml
+:
+ƒ dirxml()
+error
+:
+ƒ error()
+group
+:
+ƒ group()
+groupCollapsed
+:
+ƒ groupCollapsed()
+groupEnd
+:
+ƒ groupEnd()
+info
+:
+ƒ info()
+log
+:
+ƒ log()
+memory
+:
+MemoryInfo {totalJSHeapSize: 13400000, usedJSHeapSize: 11200000, jsHeapSizeLimit: 3760000000}
+profile
+:
+ƒ profile()
+profileEnd
+:
+ƒ profileEnd()
+table
+:
+ƒ table()
+time
+:
+ƒ time()
+timeEnd
+:
+ƒ timeEnd()
+timeLog
+:
+ƒ timeLog()
+timeStamp
+:
+ƒ timeStamp()
+trace
+:
+ƒ trace()
+warn
+:
+ƒ warn()
+Symbol(Symbol.toStringTag)
+:
+"console"
+[[Prototype]]
+:
+Object
+which is a list of methods in console
 
 Try also entering `typeof console`
 
 Answer the following questions:
 
 What does `console` store?
+methods to interact with the console
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+it means, from the object console, access the function log or assert.
+the fullstop is the connector to access the methods