@Dmitry Good luck with the setup.
It takes a bit of time to get used to how Home Assistant does things so I would strongly recommend spending some time getting your head around the terminology & structure. However maybe KNX, Lutron and ELAN control systems are constructed in a similar fashion.
It can be very powerful once you get used to the Configuration Language (YAML) at least they do the project with humour Yet Another Markup Language 
If you get stuck or have any questions just post them here. Home Assistant also has a very active forum but I prefer Arylic Forum as it is more friendly and less about people debating the best way to do stuff. 
Good Luck again, Kevin
P.S. Another nice post on Arylic Forum Basic Home Assistant interface