I think there's no harm in following the videos on YouTube. Even though many people brag, of course there are those who really teach the theory. But of course you should not accept everything without clarification. However, of course having a good mentor is a great thing.
As long as it is a lesson for us, it is clearly not wrong to follow the directions and listen to the explanations on YouTube, because I also agree with your statement that everything we hear must always be clarified by several people who really understand it. So that we ourselves will not be wrong in interpreting it properly because basically everyone is highly encouraged to learn from various things so that we can find more important knowledge for each of us.