https://support.apple.com/en-ie/guide/mac-help/mchlp1341/mac
[–] Cockbrand 3 days ago
[–] staplung 2 days ago
ssh://soandso@whatshername.com
into virtually any app (I use TextEdit), select the text and drag it out to some Finder location. It will create the file automatically. Then just click on the file (or open it with Quicksilver, Alfred, et. al) and it will open a new Terminal window with you ssh'd to the host as that user (normal auth procedures apply).
I don't use them too much anymore because there doesn't seem to be any way to get iTerm2 to be the default app to open such files (on modern MacOS versions the application drop-down in the Finder info window is greyed out) and I don't SSH into as many machines as I once did.
EDIT: turns out you can get iTerm2 to be the default opener for ssh .inetloc files; it's just done inside iTerm itself.
Settings > Profiles > [select profile on left] > URL Schemes
Another one is Cmd+H for hiding an app. People often minimize the current window to see the next app underneath, while hiding the current app is much more elegant and creates a lot less friction for restoring it later.
Which of these hidden champions did I forget?