I had the same issue two years ago after buying an iPad, and went through multiple tutorials (DrawABox, Udemy), some books. I wasn’t able to stick to any of them, until I stumbled upon some videos on YouTube by Alphonso Dunn. For some reason his way of teaching worked for me, so I bought his book [1] and I’m finally seeing progress.

[1] https://www.alphonsodunn.com/book