That's great! Koikatsu can be a little bit hard and confusing at the beginning but eventually you'll get it to work :)
The same for Renpy, most of the useful resources/links are actually in Russian!
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Yeah, Koikatsu definitely hard in begin. But there's a Russian guy on YouTube who makes short adult novels too and explains how to use the studio. I have more problems with maps, even on discord server are no maps that I needed. I guess I'll have to figure out how to make them myself. Without the necessary skills..... As for Renpy, there is a Russian tutorial from one person, I passed it. This guy explained all basics and in general everything is clear to me.