I'm teaching chess last 10 year I've experience of online teaching for 5 years for improving you chess you need to do various puzzle studies .
I teach
1. how to play chess
2 chess notations
3. chess rules
4. Openings
5.mate in 1 to mate in 5
6. Puzzles
7.tactics
8.middle game
9. End game
10.puzzles like back rank, double attack,...