How do I connect the vertices in the same mesh/shape? I want to get better at 3D modeling and here's my problem: I'm trying to make a mask, but I don't know how to connect vertices to fill the gap.



https://gyazo.com/87c9de5f88343ac9c12af3aabc6977f7
Join them Using Alt+M.

To do this select the Top Left Vert.

While holding Shift, Select the bottom left Vert.

Then Do Alt+M, and select At Center.

Repeat for the Verts at the right.