Welcome to the forum!
No seminars per se, but there is a great number of channels on Youtube that have excellent information.
One channel I would suggest is RV Education 101 at https://www.youtube.com/user/rved101
They have over 250 videos with lots of great information. Most videos are short and to the point and less than 3 minutes long.
Note - I am not affiliated with that channel, I just like their stuff.