Variable explanation help:

Concatenation:

const name = 'bob';
const lastName = 'sprinklebutt';

const fullName = name + ' ' + lastName; // Here, name is contatenated with lastName to create a new string

Conversion:

const numString = '1234';
const num = Number(numString); // Convert string to a number

Coercion:

const stringNumber = '12';
const num = 12;
const coerced = stringNumber + num; // Results in "1212"
true == 1; // true

Type coercion is the process of converting value from one type to another (such as string to number, object to boolean, and so on). Any type, be it primitive or an object, is a valid subject for type coercion.
Exerpt from freecodecamp.org/news/js-type-coer...

Truthy and Falsy:
This is a weird one in JS

true == 'true' // true
true == 'false' // true
true == 1 // true
1 == 1 // true
1 == '1' // true
1 == '2' // false
[] == false // true

Coercion happens when you try to join two different values (values like string and Number) together e.g
When you something like this

let age = 12;
let myName = "dovey";
const result=age + myName;
console.log(result)

the result would be 12dovey javascript engine noticed that they both are not of the same value and can not be joined together to get an appropriate mean so it had to coerced i.e forcefully joining them together to get a result.