I know I’m not a fluent speaker, but I wanna at least be able to communicate with people in English.
Do you understand this?
Just a yes or a no or you idiot will make me happy:

I’ve always thought that every language learner first have to learn culture if you want to become able to use a language. But it started to feel that I’ve never understood the first thing about “culture.” What’s culture??

Each country has their own ways of looking at other people, and each one of cultures can be right in one place but can be wrong in another place. and every one of them subconsciously emerges from the people who live in a culture. Can one actually “understand” cultures consciously??

Yes I can.

I find it surprising that you think so as a Japanese speaker. Japanese is rather inaccessible as a language and yet many people try to learn with only a slim chance of ever getting to visit Japan or experience authentic Japanese culture. Most people who learn Japanese start off through anime and it would be nothing short of a delusion to think that Japan is like they show in anime. Yet many of them manage to learn the language to whatever degree of proficiency and also learn a few things about Japanese culture.

The point is, I think that culture is more easy to understand no matter where you are from on earth considering that we are all one species. Perhaps cultures would be harder to understand if there were multiple sentient species just as smart and capable as humans. Like aliens. But considering that humans only have humankind for reference, we can and do understand human culture a lot more easily than if we were faced with aliens. I have more in common with you than my cats, for example, even though I have idea who you are. That is how binding biology can be. All humans look for faces everywhere they look. That's why people can find faces in clouds no matter what country they're from or what language they speak.

Nice discussion.