explanation


But I don't think it covers red squares.
Where are you seeing a red square? (A screenshot would help.)
Did you make a pre-move?

There actually is a help section and it is at the bottom left of your screen.
Ooooh. I didn’t pull the menu all the way down! Doh! Thanks!

But I don't think it covers red squares.
Where are you seeing a red square? (A screenshot would help.)
Did you make a pre-move?
I’m not sure what a pre-move is!



Red square: You've either clicked the right mouse button (or visited Moscow). Doesn't mean anything really, it's just a tool for highlighting when coaching/streaming etc.
Why can't you make certain moves that are possible: because they're not possible/illegal for some reason, eg: castling through check or something.
Pre-move: something you can enable in settings to allow you to 'queue' a move while waiting for your opponents response. You basically 'move again' when it's not your turn, and the move, if still legal, will be executed immediately as soon as your opponent moves (and cancelled if no longer legal).
Puzzles: not sure of the exact algorithm but the quicker you get them right, the more you score in general.
Good luck. Danny Rensch has done a lot of 'how to' videos on YouTube.