Good day.
Recently I meet Lua. 
I want to try it for config files and some game logic and scripts. Also this adds perspectives to fast modding.
But I haven’t experience with integration of Lua.
Is Lua using is already real in CGE? I saw news about packages, but, as I understand, this is not priority target?
Maybe you have basic recommendations how to start?.. Or reasons to not try 
No. The go-to scripting language for CGE is python, see Roadmap | Manual | Castle Game Engine
Of course you can also integrate Lua (or any other languages) yourself. A simple example can be found here: GitHub - Kagamma/cge-script-integration-example
Personally I am using my own scripting language for my game.
Understood.
I don’t like Python too much (don’t hate, of course, just don’t feel pleasure when use them ) So, maybe I try something with Lua.
Also Lua syntax more close to Pascal, so, project will not seems too eclectic.