I’ve been following a tutorial on YT, I've completed the base mesh for a character from a cube privative. The next tutorial is setting up for sculpting. I'm in Sculpting > Sculpt Mode, I have Multi-Resolution Modifier and the Mirror Modifier, I'm ready to sculpt. Tutorials say click Subdivide, how do I know it has? I read about Symmetrize and Mirror, what's the difference?
To know you've subdivided, you can look at your multiresolution modifier and it will say how many subdivisions you have done and will give you options for what to show for Level Viewport, Sculpt, and Render. It should also look smoother now that you've subdivided and have twice the amount of geometry.
Symmetrize does the same operation as mirror modifier, but you can turn mirror modifier off while with symmetrize you can only go back with Undo.