weeb ones

yes, just not commonplace

>really needs to catch up with Japan in bathroom tech in general

yes gimme those bidets

spend more time in the shell. you will naturally learn the most commonly used commands and useful flags for them. soon you will be surprised by how much you know. having good typing speed helps reduce the friction a lot. i have not found need to specifically “memorize” anything consciously.

for obscure things, write a script and put it in a scripts folder, have a comment at the top explaining what it does for reference later.