I use Claws Mail for my mail stuff. It works really well with my self-hosted email server and I really like the UI and such. On Windows I used to use the mail client that was pre-installed.
For text editing I've switched to vim and emacs (doom). I usually use vim for quick little edits to things that aren't worth opening up emacs and finding it in there and I use emacs for anything that'll take some time. On Windows I used VS Code.
For a web browser I use Firefox, hardened with arkenfox/userjs. Never had any problems with it and have been using it since before switching to Linux.
Personally I use the torrent ip check on ipleak.net. You just add the magnet to your client and it'll fail itself and then list the ip on the site.