Difference between to organize and to combine in Korean
정리하다·합하다

정리하다to organize
"To organize" means to put things in order and make them neat or easy to find. In Korean, 정리하다 is used when you clean up a space, sort your things, or arrange your thoughts. You can use it for a room, a desk, notes, or even a schedule.

합하다to combine
합하다 means to put two or more things together to make one. You can use it for objects, ideas, groups, or even numbers. In everyday Korean, it often appears in forms like 합해서 or 합하면.
The difference
This means to join things together into one. It does not mean putting things in order or making them neat.