I'll vouch for udemy account legitimacy and great teaching. All of my friends took a course there and they are doing good so far in trading, both stock and futures, but they mainly trade in futures because of its high risk high reward. There's a lot of video tutorials in YouTube, but only go for one channel to understand what you are really after. What I've like in trading courses is that they are giving videos of what they are teaching for those people who doesn't have good internet connection or those who are busy.