Fu (district) and Ken (district) kanji

were is the differencd, it would be nice if i could get your help again.

there is another thing im not 100 percent sure about, tokyo and tokyoto, were is the difference?

Japan consists of 47 "prefectures," and 1 is "-to" (Tokyo), 1 is "-dou" (Hokkaido), 2 are "-fu" (Osaka and Kyoto), and 43 are "-ken." They are equivalent units now, but have different names due to historical background.

In English (particularly when we write addresses) we tend to refer to Tokyo prefecture simply as "Tokyo," but when you want to say "Tokyo prefecture," it is "Tokyo-to." When we write addresses in Japanese writing, we tend to write out 東京都 (Tokyo-to).

東京都 is a well-defined administrative area. 東京 can mean many things depending on the context: it can mean 東京都, or it can mean Tokyo station, or it can mean Haneda or Narita airports (when looking for flights), or it can mean "the capital city of Japan" for foreigners, although this is technically false, etc.

https://en.wikipedia.org/wiki/Prefectures_of_Japan

thank you much for your thoughtful answers, very interesting