I found the green worms in my cabbage, but I peeled away all the layers that had holes in them. Is it okay to still eat the cabbage that wasn't eaten? Do the worms lay eggs and such? Please help!! Thanks!

Just wash the cabbage leaves. They're fine to eat, including the ones with holes. They're just holes. The cabbage moth will lay eggs and they hatch into the worms but a rinse will remove them and any tiny caterpillars.
For protection against these pests, cover the plants with netting. Even light bird-netting will do it.

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The secret is the soil.