then start with
Absolute Beginners Guide to Emacs http://www.jesshamrick.com/2012/09/10/absolute-beginners-gui...
follow up with Emacs' tutorial and online help
follow up with Mike Zamansky videos on YouTube https://cestlaz.github.io/stories/emacs/
finally check out the blog entries (and the book !) at https://www.masteringemacs.org/