1. How Browser works?
2. Basics of web-security.
3. Refer the below image, which is required for whatever path we choose. We will be spending our everyday with all of these. 
4. SOLID Principle.
5. Git cheat sheet.

Note: Principles like SOLID, KISS, and DRY are very important.

install Node.js (stable version).
install Git.

1. Create a Codepen account, and try to solve small HTML, CSS, & JS problems here.

Note: Use your preferred choice of code editor, I would recommend to use VS code (it’s a lightweight and has much customisation).

Note: Road map for Frontend development. This is just for reference.

1. Basic CSS selectors.
2. Css guide.

1. A11y.

1. Basics of Javascript.
2. Scopes in JS.
3. Event bubbling and capturing.
4. How ‘this' keyword works in JS ?.
5. Prototype.

Reason why do we need to choose a style guide is, all code in any code-base should look like a single person typed it, no matter how many people contributed.

1. Airbnb styleguide.
2. Idiomatic.js.

• Eloquent JavaScript - Covering the language and runtime specifics.
• You Don't Know JS (book series) - Series of books diving deep into language.
• JavaScript Design Patterns - Classical and JavaScript specific design patterns.
• Mostly Adequate Guide to Functional Programming - Excellent primer to functional programming using JavaScript.