Nothing special here, just followed along.
- Flipped faces are easy to identify (those that are highlighted strangely when rotating around the model), or can indeed be found by backface culling or just showing the normals.
- Fiipped all around (without missing the bottom)
- Done
Alternatively:
- Automatically using the approach in the course, or in the tools on the left, under “shading/UVs” there is also a button “recalculate”.
Finally, for the shortcut-minded people. When doing lots of things on vertices/faces/edges, I just use ctrl-V/F/E (easy enough to remember) to get the menu. I find going to the “mesh”-menu cumbersome. Not that special (the shortcuts are mentioned in the “mesh”-menu), just my 2 cents.