I think you are the best teacher for React, nodejs, and firebase. After completely completing the React and Reudx basics course, if you memorize all the lectures uploaded by John Ahn, follow the lectures thoroughly once and take careful notes, refer to the notes once and make it, make it once without looking at it, and make it once again and create a few of them yourself, I think your skills will improve very quickly. The only regret is that it would be great if you could make one lecture that covers cloud functions.