I want to make games WITHOUT USING UNITY OR ANY OTHER ENGINE how?

Answer 1

https://www.sololearn.com/discuss/938441/?ref=app
https://www.sololearn.com/discuss/625747/?ref=app

Answer 2

There are a lots of games engine.
Some game engines are completely open source. Like webgl, threejs, pixijs. And much more

Answer 3

you can check code playground, search terms 'GAME' you can see some good example of vanilla browser game