where I can learn bootstrap ?

Answer 1

Learn it from.sololeanr
But the docs of boostraph are so easy to have at there too

Answer 2

In sololearn here
https://www.sololearn.com/learn/1051/?ref=app

Answer 3

You can try in other sites such as:
https://www.w3schools.com/bootstrap/bootstrap_get_started.asp

Answer 4

Thanks Mighty Coder and @Tanay Bhatt AKA Dragon

Answer 5

Txn Abhay

Answer 6

Txn James Clark I. Vinarao