How to do parsing correctly?

Question

Parsing

You need to parse a large amount of information. Information should be updated at least every 5 minutes, ideally online.
The programmer suggested an option with proxies, which are constantly banned and cut down, according to him. Actually the question is how to do such things correctly and what options are there and how much can it cost approximately?

Answer 1

There was an interesting article on habrahabr on a similar topic habrahabr.ru/post/69149