Q.What Is Destroying My Basil And Cabbage?
My cabbage and basil are eaten by insects, I don’t think it is slugs. What can I do?

Certified GKH Gardening Expert
This looks like a combination of, both, insect and fungal/bacterial damage. Fortunately, for the rotting damage, it can be treated with the fungicide of your choice:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
Neem oil is my go to for, general, insect control:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/azadirachtin-vs-neem-oil.htm
But there are several pesticides to choose from:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides