The specific techniques barbers use when cutting Type 4 and afro-textured hair, how coily hair behaves differently from straight or wavy textures during cutting, and the approach differences required for natural afro shapes, tapers, and fades on this hair type.
The scissor-over-comb technique, when barbers use it instead of or alongside clippers, the mechanics of working through different hair types and densities, and how to build consistent results in areas where clipper access is limited or undesirable.
The specific techniques barbers use when cutting Type 2 and Type 3 curly hair, how curly hair shrinks and behaves differently from straight hair during cutting, and the approach that produces clean defined results without the puffiness or frizz that indicates the technique missed the curl.