I recently purchased a secondhand HHKB. Its a 60% keyboard that doesn't have hardware arrow keys.
Ordinarily the arrow keys are bound to
⬅️ = Fn + : ⬇️ = Fn + ? ⬆️ = Fn + [ ➡️ = Fn + "
This is not ergonomic at all and I found it very difficult to get used to.
I eventually settled on what I think is the best binding:
First bind Capslock to Ctrl
Then use vim bindings to navigate
⬅️ = Ctrl + h ⬇️ = Ctrl + j ⬆️ = Ctrl + k ➡️ = Ctrl + l
These are my default bindings on all my machines now. I used KaribinerElements to do this in MacOS and xbindkeys in Arch.