I normally avoid hair typing charts because in my mind, as long as the hair is healthy no other distinctions really matter to me. I didn’t even bother finding out what hair type I have until I was well into my hair journey; it just didn’t matter to me.
I do however love this chart by Alma of BlackHairInformation.com because it doesn’t focus on classifying hair into 3abc/4abc but instead focuses on how best to approach hair care based on texture and thickness.
I have fine hair but surprisingly, I’ve never done a hard protein treatment. Truth be told, the idea of doing one scares me haha.