What is bootstrap?

Question

I have some questions about it. Can I programme in JS with it? What about HTML?

Answer 1

See here
https://www.sololearn.com/learn/1051/?ref=app
Yes, you can program in JS with it.
and it uses HTML as base language

Answer 2

Please see the Bootstrap 3 lesson for an answer. Yes you are using HTML and CSS in bootstrap. And you can use JS.