Which credit cards do you recommend?

Hey so I'm looking at getting a credit card while in Japan. It's honestly mostly for renting cars and buying plane tickets etc. I'm not really getting it for daily use.
I'm trying to figure out how it works in Japan but the majority of websites are just focusing on the points you can earn and doesn't seem to be giving any details on repayments/fees.
Does anyone have any advice?
Tried looking online but it's all very American focused. I'm from Ireland so advice aimed at Americans hasn't really been helping.
I never intended to get a credit card but it seems pretty essential here. Any advice will be so helpful and appreciated ☺️

by cobble98