do you think I could learn to play the keyboard through YouTube videos?

There's a wide range in skill to being able to play the keyboard. I think you could learn the basics for sure, although things like learning to play with proper form may require an in-person instructor to really get down right. I don't play with proper form myself, and I don't think I would ever be able to learn to do it only via youtube videos myself. But you aren't me and ymmv and all that. I don't see a downside to trying.

Probably. I've seen some good teaching videos on YouTube.

Yes. You can learn so many skills from youtube. Its like having many private tutors.

Sure why not

A person claimed he learned how to steal a modern car from a YouTube. So why not a keyboard