Vim Tip 7 - normal mode
Not very practical, but a metaphorical/philosophical tip.
Normal mode has this name for a good reason. It's the natural resting state
programmers spend a fraction of their time composing code. More time is spent thinking, reading, and navigating from one part of the code base to another.
Vim Tip 8 - chunk your undos
Every trip to the insert mode creates an "undoable" change.
Note: when in insert mode, if you move around using the arrow keys you create another undoable change.
Vim Tip 9 - compose repeatable changes
Pretty much the most important lesson I learned from Mastering the Vim Language: use text-objects to make your changes repeatable.
There was also a link to https://www.vimgolf.com/. Which is an interesting thing. 🤓
See also Vim Tip 12 - vim language.