What pitfalls await in creating a telegram bot?

Question

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Good afternoon, there is a desire to write a bot for telegrams that would inform me about all the changes in the VKontakte group, like, comment, repos, message, up, out.
Interested in what this will require a server part, preferably a free implementation, also links, tips on implementation.

Answer 1

In fact, everything is here (provided that the group is yours):
https://vk.com/dev/callback_api
Receive event requests to your server. Next, send to telegram.

Answer 2

Here is a free Go framework: https://github.com/strongo/bots-framework