How to get the most out of Bootstrap 3 on Symfony 3?

Question

symfony

What bundles do you use for maximum bootstrap compatibility with symfony?
Here is a list of what I want to get from this bundle:
1. Connect only the necessary bootstrap components for each page,
2. Exclude unused CSS and JS from the project, it is advisable to use your own class names,
3. Use bootstrap less variables and mixins to create topics.
If I said something strange, correct me, I am not competent enough in this matter.

Answer 1

1. it makes no sense. You can select critical-path css and that's enough.
2. this is done not with the help of bundles, but with the help of all kinds of tools for building the frontend.
3. symphony has nothing to do with it either.
In short, the recipe for success is the frontend separately, the backend separately.