In order to make online training affordable for the majority of chess friends, I will start with open webinars as of January 2023. The focus will be on the middlegame, as it is the most crucial part of the game. Its complexity can be seen, when only looking at this list. For me it makes a lot of sense to start with the most fundamental topics:

Webinar 1: Weak Pawns

Webinar 2: Weak Squares