What are some essential things to know if moving to Japan?

Question:

I'm not moving for at least four more years, but I thought this was important to know. What are some things I should and shouldn't do, how will people treat me, and what are some good jobs there? In case it matters, I am European.

Answer:

The first thing to know is you just can't move there. You need a BA / BS degree to qualify for a work visa. You also need to have a job offer before you get there.
Most foreigners teach English. And most of them are native English speakers.
"European" isn't a nationality. French, Greek????????
You'll need a have a job skill a Japanese doesn't have.