https://rapidgator.net/file/ce802816714bba4eeff633b971f39c88/The_Complete_macOS_Catalina_Manual_-_8th_Edition,_2021.pdf.html

or
https://uploadgig.com/file/download/d459756d3da522ce/The_Complete_macOS_Catalina_Manual_-_8th_Edition_2021.pdf