Some noobie questions

Hey jjasper108 

We all start as noob's, and we ask the noobie questions.

1. You have overlays turned off (top right of the 3d viewport)

With it turned off the verts are not visible, although you can still select them.

2. It looks like you may have flipped normals.

In edit mode select everything, then in the 3d viewport at the top select Mesh > Normals > Recalculate Outside (or with everything selected the shortcut SHIFT+N)

3. Probably same as 2.

Hope this helps! 

Happy Blending

Hi Jasper, that looks like a case of inconsistent Normals (happens a lot!).

Please enable the Face Orientation Overlay:

Everything should be blue.

If you see red,  you can, in Edit Mode, press A, to select everything and then SHIFT+N, to re-calculate the Normals.

That should fix it. If not, let us know.

Actually, there might be something more going on here:

If fixing the Normals isn"t enough,  try M > Merge by Distance (in Edit Mode, with everything selected) and check if there is an 'inside Face' like here:

And is that a diagonal Edge that shouldn"t be there (same area), splitting the face into two triangles?

HI, i tried recalculate normal. it didn't work. Here's a pre merge and after merge 

Pre Merge:

After Merge :

This is with Face Orientation Overlay on :

I try to flip to make it blue :

Do you want the blender file to identify the problems?  Thanks for the help

If you can share the file it would be useful

I think I see the problem:

kk i tried to delete both Vertices and bridge loop again. still didnt work. Same thing happened

Here's the link :  https://drive.google.com/file/d/1u_ZNt5eaD2HuY90LuJDHQaMONsnS0LNF/view?usp=sharing

Thank you for the file wweeple 

I looked at this edge loop and Merged the Vertices:

Did the same with the whole cup selected:

But there was still something strange going on here:

deleted those Vertices and:

The Normals are still flipped, but at least they are consistent, so not a huge problem...

Kk, I will try it when i get back home from work. Do you how did this happened so I can avoid it?