Let's think about how your hair feels, to the touch. Coarse texture can be anywhere from a little coarse to very coarse. Very coarse needing 100% moisture only products.
How do you know? After conditioning, if your hair feels silky soft, you don't need 100% moisture in your styling product. f it still feels coarse after conditioning, or you struggle with frizz then your needs are 100% moisture.

Merriam-Webster Dictionary: Texture. Noun. the way that something feels when touched. Examples of texture: The rough texture of wood The soft texture of silk

Did you know that all curly hair is fine?
Unless you have the "thick hair gene", which originated from central China more than 35000 years ago, you have fine hair. You may have a lot of it, or it may be swollen, but it is fine.Fine hair can be coarse or silky soft, regardless of curl pattern. It needs to be fine in order to twist and turn.The curlier the pattern, the finer the hair strand.