I’m new to commuting and I wanna know if Suica can be used in buses?

I'm in the area near Numazu, Shizuoka. And I'm wondering if Suica can also be used for the buses? And if it's okay to be used in non-JR trains? I'm also wondering if it's okay to use for Shinkansen or it's a separate thing for tickets??? Please help. I'm new in commuting and it's giving me anxiety with these stuffs.

by notyouladybbm