Hiragana and Katakana, just write again and again.
Children in Japan learn Japanese letters like that. :)
Kanji is originated from drawings.
For example, 木 ( き / ki ), which means a tree, looks like tree, isn't it?
And 林, which have too trees in one letter, means grove ( small forest ).
Moreover, 森, which have three trees in one letter, of course means big forest!
It is interesting to think about how Kanji was made.
The more interesting, the easier to learn!