What kind of paper do Japanese write on?

do they use line, square or plain paper for writing kanji?. QUESTION#2 Which one should I use if i'm trying to learn/write kanji? I tried using line paper, but it's difficult to fit some kanji between the lines, should I keep trying to use regular line paper and get used to it or something else?

For practicing kanji Japanese school kids use books ruled with large squares at least a cm square if ot more for each kanji.

For everyday- writing notes to people etc, taking notes in a class etc, most people use an ordinary horizontally ruled notebook or plain paper- Japanese people are used to writing kanji so don't have as much trouble fitting the character between the lines as a learner would.

Some characters do take up more vertical space than others, definitely, but with practice they should all fit between the lines.