Q.What is eating holes in the stems of my hosta plant? What should I do to stop this?
There are multiple holes in the bottom sections of the leaves on my hosta plant; the leaves are turning yellow and brown, and then they die.

Certified GKH Gardening Expert
Sounds like slugs have found your Hosta, though it could be other pests, too.
These articles will help you.
https://www.gardeningknowhow.com/ornamental/foliage/hosta/hosta-pest-control.htm
https://www.gardeningknowhow.com/ornamental/foliage/hosta/hosta-problems.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm