Noob question about solids

I’m just starting out with Rhino, and have gone through some of the tutorials…however. I’m trying to create a model of the old Tupperware pitcher lids. I created the shape that I’ll later use ArrayCrv to finish it. When I tried to shade it, it remained a wireframe and see-thru, rather than solid…I don’t understand why. I used the gridsnap and connected all the lines…shouldn’t that make it solid? Remember, I’m new at this lol. Thank you for any help.

I’m reading between line lines here, but connecting up curves doesn’t automatically create surfaces or join the surfaces together into closed solids.

You would probably get going faster by going through some Getting Started tutorials:

The User’s Guide is probably the best for a progressive collection of tutorials.