Symfony 3.4 How to load blocks if there are a lot of them?

Question

symfony

It is necessary to load blocks if there are a lot of them, as in VKontakte news, for example.
I can’t figure out how to do this, it’s clear that through ajax, but I can’t imagine what to write in the controller.
push me)

Answer 1

I push, you just write ajax requests in js and that's it, but what's the actual problem?