Services like Bootstrap, are they reliable?

[joycer]

I was just wondering I will be using their code in my site, right?

Are they perfectly reliable? I mean hacking and other malicious activity wise.

[brian]

Are they perfectly safe? I don't know as I don't have knowledge in programming languages.

But I also haven't seen a complaints or any user raising these type of issues.

[smartscraper]

Bootstrap is used by 26.6% of all the websites whose JavaScript library we know. This is 21.7% of all websites. (as per sources)

so this will give you idea how reliable it is!