Calculating


Calculation develops through practice. In the old days, we used to have to play out the games on a real board. That took some mental effort. Variations were trouble because after they ended, you had to reset the board to the last position. Going back and forward through the variations gradually becomes easier as you practice it.
If you go back and review a game the next day, you hopefully retain some of that.
You can start by learning the names of the squares by using the vision trainer. https://www.chess.com/vision

I great way to help develop calculations is to solve puzzles. Try to do them daily and take as much time as you need to think through the position.
@Trey+1. Solve random puzzles every day. Say 5 a day. Little and often. This will gradually strengthen calculation/visualisation. Solve the puzzle fully in your head before moving pieces. They need to be hard enough that you have to calculate different variations to find the solution. The chess.com rated puzzles are good for this. Ignore the clock. Aim to get it right first time.