Can I used it all types of Trains in Japan

Hi there!

You can use the JR Pass for all JR trains in Japan except for [certain exceptions detailed here]. The main thing to be aware of is that the JR Pass is not valid on Nozomi or Mizuho class bullet trains. In practice there are always alternative Hikari or Sakura bullet trains available on these routes that are valid for JR Pass so this should not be an issue.

Hope this helps!