How to ask strangers to teach me a word/phrase everyday

I travel to Japan fairly often due to work, but I never quite learned the language properly. I know a decent amount of vocabs and can usually get my point across by stringing vocabs together.

I was thinking of challenging myself on my next trip by asking strangers to teach me a useful phrase everyday. (And just start conversations)

This is more or less what I want to express:

“ I’m trying to learn one phrase or word from strangers everyday, it can something useful or something foreigners usually wouldn’t know ”

Any advice on how to say the above is appreciated, feel free to write in kanji.

Edit: Some people seem to have the wrong idea down below. When I say “strangers” I don’t mean going up to random people on the street.

I’m talking about people who are already in a conversation with me, but I don’t really know them