I think you can watch youtube video about trading to know the primary level .You can follow the market as well you need to spend time on market to get the vast knowledge.
I also often watch videos at Youtube and it helps me a lot in trading. However, you should be selective because they are not always accurate and can help you improve your trading. Personally, I'm usually only interested in the advice of good traders in this market because they will give you a lot of good lessons and will share some of the strategies they often use.
Yes, youtube is a good source for anything that you want to learn. It has almost everything from the fundamental to advance level. However, as you as, being selective is required when using youtube because not every information on this online video-sharing platform is correct and can be obtained. Some channels provide quality content and knowledge but the others only care about the profit and referrals. Beware of them cause they can give you false information which leads you to a wrong way