fun games for practical skills
Command-line
vim
vim-racer
Learn vim motions, commands, and shortcuts in a user-friendly interactive environment. Compare your scores to those on the leaderboard to learn hidden techniques!
vim-adventures
"Learn VIM while playing a game!"
OverTheWire Wargames
"The wargames offered by the OverTheWire community can help you to learn and practice security concepts in the form of fun-filled games..."
And you don't even need to sign up for anything!
https://overthewire.org/wargames/
Typing Practice
Monkeytype
Very customizable with lots of different ways to change up both the rules and looks of the game.
keybr
Great at targeting practice toward your "problem keys."