Could someone direct me to an article that tells me what I have to unlearn in High Sierra when I install Big Sur? I got a new iMac 3 months ago with Catalina installed. I haven't learned much about Catalina yet and use it as I did High Sierra. I have not experienced frustration. I assume most of High Sierra techniques work fine in Catalina. Thus I don't have to learn much new to continue but am missing much of what Catalina offers. Will it be the same going to Big Sur? Or as a low level user should I sit tight until I have to change.