Is this important to learn HTML, JavaScript, and CSS to make an web app or game

Question

https://code.sololearn.com/WAjzJ95mx3uQ/?ref=app
https://code.sololearn.com/WHjdK84g0jn8/?ref=app
https://code.sololearn.com/Wunr28ZeM881/?ref=app
https://code.sololearn.com/WDQE31xM0Xix/?ref=app

Answer 1

Yes, learn them.

Answer 2

Ok
Thanks

Answer 3

Yes.you want to learn HTML,CSS,JAVASCRIPT,PHP,JQUERY, BOOTSTRAP and any Backend like Python,JAVA etc.But as beginner HTML,CSS,JAVASCRIPT is best.