What is the difference between 썰다 * 자르다
I know that both means cutting, but when you use one and when the other?
썰다To cut
자르다To cut
What is the difference?
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Question

Answer

자르다 : to divide something into two pieces with a sharp-edged instrument 
썰다 : to slice, to make something into smaller slices with knife or saw (usually repeated action)

머리카락을 자르다(O)
머리카락을 썰다(X)

Answer

When we cut sth, mostly kind of food ingredients, with a nife, we use "썰다."
ex. 나는 된장찌개에 넣을 파를 썰고 있다.

When we cut sth with scissors, we use "자르다.” 
ex. 머리를 자르다 / 종이를 자르다