Can this hair be curled and straightened if u plan to crochet this hair in your crochet braids?

It can be curled and straightened with hot water methods, but not by hot tools. It is a low temp fiber, which means it is designed to be very responsive to heat, and will smooth melt at higher temps. This works amazingly well for creating intricate styles with steam and water heat (or creative applications where melt sealing is necessary), but it won't hold up to regular human hair styling tools with the way it is designed.