I want to learn css and Java script both at a time, should I go ahead???

Answer 1

Yes, you can. But it is recommended learn CSS before learning javascript.

Answer 2

Yes by all means.

Answer 3

You have to learn first HTML5.. then you can learn css alongwith javascript.. then it'll good for you..
Good luck..
https://www.sololearn.com/learn/HTML/1021/
https://www.sololearn.com/learn/CSS/1078/
https://www.sololearn.com/learn/JavaScript/1123/