Switch to lichess.org (open source, has all of chess com’s paid features available for free, plus no ads or trackers).

Start with the chess basics set: https://lichess.org/learn

Then the basic tactics set: https://lichess.org/practice

And then do puzzles: https://lichess.org/training (chess com makes you pay for more than a few per day). Do a lot of them.

Then, you can also analyze your games on lichess using it’s analysis engines (which chess com makes you pay for). Uh I can’t find a good guide how to do this right now, check back later.