How to communicate with the API of various sites?

Question

API

In this regard, I still do not know anything, so who can, describe the process in detail. API, for example, vk.com. Where and what requests to send in this case, for example, to create a bot (without any wrappers).

Answer 1

As always, go read the documentation, there are a lot of examples and documentation. Write in any language convenient for you, there are even wrappers for popular ones

Answer 2

How to communicate with the API of various sites?

- Using the API of these sites.
API - it is, as it were, used to communicate. If the API is open, then there is documentation on it. And the documentation contains all the information that you need (at least to start).