I have extremely poor soil that seems to be 98% stones! What do you suggest for planting on the level areas (right now I have been planting dutch clover) and on the steep areas? I've tried getting some ground covers established on the steep areas but they dry out and then when it rains they wash away. Thanks for any suggestions.
A big piece of information that you've neglected to provide is where you're located. What kinds of plants you can grow depends very much on your USDA hardiness zone. https://www.gardeningknowhow.com/planting-zones/usda-planting-zone-map.htm
Here are some articles that have tips on dealing with hilly areas: https://www.gardeningknowhow.com/special/slope-hill/hill-ground-cover.htm
The best thing to do with poor soil is to amend it with organics. It will take several years of determined effort, but it can be done. This article will get you started: