I use Karabiner-Elements (free) to make caps lock a hyper key.
Tap is mapped to F18, which opens Alfred (may be switching to Raycast soon).
When held, it’s Hyper like everyone above, and my shortcuts are kind of ill-defined.
Hyper-M copies the highlighted text to the clipboard, opens Textmate, and pastes the clipboard into a new window, where I can do things like use multiple cursors, etc.
Hyper-V types the clipboard contents, so that formatting is removed.
That’s about it.