For me it's
Gary Dayton - Chart Reading Mastery
Feibel Trading - Logical Price Action
Both are Wyckoff based! If you are looking for a ruled bases system this isn't for you as you will have work hard at it before it really starts to make sense and you can start to see the trade! When I first started I was lazy and wanted some system to follow but found out like most the hard way that they don't work and the only way is through hard work and diligence to the craft and letting go of the get rich quick mentality that was crippling me!
The best piece of advice I can give you is to find something that resonates with you and stick with that and stop jumping from system to system when things don't go well for you, find out why it's not working and learn from it! Our loses are our greatest learning opportunities, after all we paid for it with the loss:)
The most important course I watched was Van Tharp - Position Sizing
This alone helped me to protect my account as before I was all in instead of scaling in. It also helped immensely with my psychology somehow, maybe due to the fact that now if i'm not sure on a trade I lower my % at risk then increase as trend get's under way!
Good luck to all on this journey to trading success!