There are so many useful shortcuts in most pieces of software, and you can usually customise them as well.
When developing, I use Netbeans IDE, and it has a lot of good stuff, that I wish I’d known about a lot earlier.
Here are some that I use all the time:
- Neatly format your code with indents (you can set your preferences at Tools > Options > Editor > Formatting) : Alt-Shift-F
- Jump to the corresponding tag (e.g. from to its closing, or from { to }: Ctrl-[
- Jump to last edit: Ctrl-Q
There’s more here.
The only problem is when fat finger syndrome strikes, and you then need to use the most valuable shortcut on any piece of software: Ctrl-Z