Blaze Foley’s Live at the Austin Outhouse
https://open.spotify.com/album/20jfTvbCUwJjOAhPkeIv61
Blaze was an outlaw country artist who, like many outlaw artists, struggled with relationships and substance abuse. His awareness of these issues made his music more powerful and his early death even more tragic. Recently a biopic was made about his life, named Blaze.
I don’t know the first thing about building stairs but I can tell you what I’d do to learn: not use YouTube or social media as a primary source for learning.
You should go to the library and find a book or five that talk about stairs, including basic principles. Maybe buy one of your favorite books or use that information to find one online.
This is major structural work on your home. You can cause a bunch of damage and expose yourself to uninsurable liability if you do it wrong. Unlike many other projects, you can’t necessarily redo a wrong turn you take here without substantial investment. If you don’t have someone you 100% trust to build stairs themselves watching over you, failure to adequately plan can make this a nightmare.