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This is my first year planting a veggie garden that I'm crazy proud of (started all the plants from seeds, also a first time thing for me) and something is eating/destroying my cabbage plants and eggplant plants. Does anyone know what this is and how I can stop it?

We searched it a little and just bought BT to kill off worms, if that's what it is. Is this treatment the way to go? Thanks in advance!

Almost certainly cabbageworms and/or other caterpillars, so Bt will help, but look over those leaves carefully and you should see the culprits.

The shot holes in the eggplants are most likely flea beetles -- did you try turning over the leaves to look? Tiny black round beetles.

Some of that looks like slug damage. Slugs are not caterpillars and are unaffected by Bt.

I like diatomaceous earth, which works against most things that would crawl over it, including the cabbage worms and the slugs. It is not a poison, just works mechanically and is harmless to non-crawling critters, including humans. Only drawback to DE is that it has to be re-applied after rain. But if you are in a dry summer area, that's not such a big deal.