I used to think this way as I've been able to touch type for a very long time but in total darkness it's very nice to be able to find a key/orient things.
Your keyboard should have two nubbins on it so you can easily find the F key without looking (it puts your hands in the home row). If your keyboard doesn't have these, then either it's 100 years old and someone is typing with the force of a gorilla, or you have an extremely strange keyboard.
The real tricky part are the less used symbol keys.
Yeah I dunno. They’re split in groups of four, but even when I think I’ve got it under control somehow F4 and F8 are the same. And yes. Gotta be careful not to hit enter when you mean to hit backslash.
dim indirect light from behind the screen is best IMO and that's also enough to find that rare key, as well as your drink without knocking it over and causing havoc.