protocols, clients and server setup for dummies

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The more people this helps (for good purposes), the better.

I thank MiraclePtr, whose articles taught and inspired me a lot, ChatGPT for correcting my crooked phrases, Chacha the cat, who distracted me while writing the article, and also… although not, about another person and what he did better here I won’t write, because this would be propaganda of non-traditional relationships, and this is prohibited in modern Russia (as, indeed, is the dissemination of knowledge about bypassing blocking, it’s worth thinking about it).