Here's a few fundamental topics in JavaScript which I think you should take a look at. You do not have to memorise these or spend a huge amount of time behind these, but it'll be better if you just go through them once before moving onto the next levels.

<aside> 💡 Anything that is underlined is a link, including headings. Although I have added some links, mostly to W3Schools, you can choose to explore more on your own. These concepts are pretty straightforward and I don't believe you need to spend hours on video lectures, so maybe consider playing around in a sandbox and calling it a day.

</aside>

Data Types

• Primitive Data Types
  • undefined
  • null
  • Boolean
  • Number
  • BigInt
  • String
  • Symbol
• Objects

Operations

• Operators
• Switch Statements
• Loops
  • For
  • For In
  • For Of
  • While

Functions

• Functions with keyword

function multiply(a, b) {
		return a*b
}

• Arrow functions

multiply = (a, b) => a*b