The macOS User Guide would be a good start although it’s just documentation rather than videos.
ThisIsE has a good playlist for beginners as does MacMost although both are a few years old.
You can also pick up Guy Hart-Davis’ “macOS Sequoia For Dummies” which is a great book for beginners.
I’m going to miss those concave trackpads from v1 but fuck yes, this is really happening!