How can i make easy 2d game

Answer 1

https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_Breakout_game_pure_JavaScript

Answer 2

answer is in your tags.

Answer 3

use HTML for structure, CSS for decoration, and JS for interactivity

Answer 4

try to use Canvas or the p5.js library, which I recommend you because for me it's easier to understand