When to capitalize "Japanese":
* As an adjective: "I love Japanese food."
* As part of a proper noun: "I took a trip to Japan and met some friendly Japanese people."
* As a noun referring to the people: "The Japanese are known for their politeness."
When NOT to capitalize "Japanese":
* As a general term referring to the language: "I'm learning Japanese."
* When used as a common noun: "The restaurant serves Japanese and Chinese cuisine."
In short, follow these rules:
* Capitalize when it's part of a proper noun (referring to the people or the country) or when it's used as an adjective.
* Don't capitalize when it's simply a general term for the language or when used as a common noun.
Let me know if you have any other questions!