Q.What to Do With My Garden After 1st Freeze
What do I need to do after the freeze has killed the plants; do I need to keep up with a compost?

Certified GKH Gardening Expert
Normally after the garden has died back, you can clean up any dead material. Discard any disease plant material and compost the rest. It can be helpful to put out a layer of leaves or straw to keep weeds down.
These articles may be helpful:
https://www.gardeningknowhow.com/garden-how-to/projects/fall-garden-clean-up.htm
https://www.gardeningknowhow.com/garden-how-to/info/cleaning-up-garden.htm