Well the only way to improve is on 3D real chessboard.
Computers do not help beginners
I disagree. Some people find that in order to get better at playing OTB, they have to practice using an actual chess set like the one they'll be playing with. Others find that studying diagrams or computer screens is just as useful as the real thing. I think it's something that's different in the wiring of different people's brains. Not everyone learns the same way.
Personally, I have no problem studying diagrams in books, using a computer for study, and translating those skills to OTB play.
Well the only way to improve is on 3D real chessboard.
Computers do not help beginners