Second this. Blackmagic’s DaVinci Resolve is amazing. Probably my favorite video editor (although I usually have to use Adobe Premiere for work). It’s fast, fairly easy to use and probably has everything you need unless you’re doing very specific and high end professional work. It’s also rock solid. The only time I had problems was when I tried to render a few dozen (simple) timelines in one queue on a MacBook with 8GB of memory. Can’t exactly blame DaVinci for crashing on me there.

And as a bonus: it even runs on Linux. Although kdenlive is also a surprisingly good alternative there.

In general, you just tell them to use your new address, change your online accounts, etc. and for the transition phase, you either forward or, like I did, just have both accounts in your mail app until you’ve reached everyone who needs the new address