Hi! You are more than welcome, but I hope the developer meeting discussions won’t be too high level if you are a beginner. We had a meeting about tutorials and education a while ago, and we added a list to the aerial robotic landscape about different courses to follow. I’ve written a more comprehensive blogpost about it as well (yet to be converted to the landscape).
Anyway, if you happen to have an questions about how to get started with PX4 I also recommend the PX4 community Q&A that is right after the ROS-aerial meeting: Dronecode Calendar — Dronecode Foundation