I started playing piano in February/March and since 'real' lessons are out of the question right now, I wanted to learn it the right way. I looked around and I didn‘t wanted it to be a party trick, where I can play 3 songs by heart and that‘s it. I found pianote and to me it‘s one of the best teaching sites about a particular subject I‘ve ever seen. They take so much time to teach you the fundamentals and their progression path with 'The Method' makes learning fun and challenging. If you‘re looking for a good online course, I think there‘s no better one out there. Even a friend of mine, who plays drums in a band heard of it and said he only heard good things about it. I practice almost everyday and pianote is the best investment in myself I did in a long time.
edit: ah well, the HN downvote army comming in for voicing my experience on the subject discussed, what can you do... ¯\_(ツ)_/¯