One thing I find helpful to determine texture, is to pluck off a few hairs (newer, shortish hairs are best to use). Hold each one at the root, and hold it sideways, parallel to the ground. If its coarse, it really just sticks out and doesn't bend much. If its fine or normal, it bends and hangs straight down. It's hard to distinguish between normal and fine hair really, but by rolling a strand between your fingers- if you can't really feel much substance, it's probably fine.

My grays are coarse, everything else is normal.

Here's a link for determining porosity and density that shows a different technique I had not seen before:

How to Find Your Hair Porosity and Density | Curly Nikki | Natural Hair Styles and Natural Hair Care
2C/ Coarse/ Normal porosity/ SW Florida/ Salt & Pepper
Cleanse: AIA cowash, TJ Tea Tree Condish
Condish: JC Too Shea, Tresemme Botanique
Stylers: flax/okra gel or KCCC + CJ PP or JC Spiralicious
Experimenting with Got2B Ultra gel and loving it so far!