>In Russia it is very common and habitual to shake hands with a man you know, for example, your friend or just an acquiantance. Is it the same in your country? Do you shake hands every time you see your friend?
Short answer: Yes.
Longer answer: I'm not sure if it is quite the same as in Russia and not every greeting in Germany is done via handshake. But I don't know if it might look like that for a foreigner. When it comes to handshakes, there are different attitudes depending on age, professional setting, closeness of friendship, gender and so on. The coronavirus has also lead to some changes with fistbumps, elbow touching or touchless greetings becoming much more commonplace.
For me personally, a handshake feels a bit too professional when meeting a friend. Often I say "hi", raise my hand to greet and don't touch them at all. Or I do a handshake and transition into a half-hug with the other hand.
Something that is also done, but I personally dislike very much is the "father-in-law grip", when you shake hands and grip the upper arm with the other hand. I think this is supposed to be some kind of added familiarity while remaining professional or a power move in a business setting. I was personally greeted like this by a very thirsty gay guy who later turned out to also be a child molester, so I don't like it.