How to make button from image or glyph icon in bootstrap?

Question

Bootstrap

I'm doing this for the first time, if it's called so correctly and I have so much knowledge that I don't even know how to create a button from a picture. If you don't mind, explain in great detail how to do it with a picture and with a glyph icon separately.
If it's not clear what I'm asking, then look - I need a button with my icon image, but I don't know if I need to override the bootstrap styles or just insert an image and hang a click event on it. I don't know how it would be correct in the context of bootstrap.

Answer 1

<a class='btn btn-primary' href='#'><img src='trololo.jpg'></a> <!-- кнопка с картинкой -->
<button class='btn btn-primary'><i class='glyphicon glyphicon-plus'></i></button> <!-- кнопка с иконкой -->

Something like this.