i'm looking for a good trading course. i found some good ones on udemy based on reviews but im not quite sure if they are actually worth it.
Sorry to say this but I have spent several hours trying to find some good course but it's all the same half baked information! If they where that good they wouldn't be updating these course over time. But from what I have noticed the good traders have actual websites and traffic flows to them by people recommending them and not tapping into a platform that already has an audience 
i dont know how to value them. i want to learn trading from A to Z step by step without jumping here and there on youtube. ive been doing quite till now but i feel i have knowledge gaps. if u can please link me to some nice courses i'll be thankfull.
"A to Z " I see what you did there, this sounds like some udemy course, I used it and didn't like it 
Btw don't underestimate the power of YouTube, your results are as good as your search it's all in knowing what trading style you want to attain.