What should you know about Japan language at the beginning?

1) The most widely spoken language in Japan is Japanese, which is separated into several dialects with Tokyo dialect considered standard Japanese.

2) Not until shortly after the turn of the second century did indications of language appear in Chinese texts. Chinese characters were adopted and records of spoken language were made in Japan. Hiragana and Katakana characters were incorporated as a relatively accurate way to represent the sounds of Chinese characters.