In the backyard we currently have a small patio and a lot of lawn. We also have a toolshed, which seems to be sinking into the earth because there's no real foundation underneath it. We want to invest in some raised garden beds (bad knees and backs), something like this: https://eartheasy.com/deer-proof-cedar-complete-raised-garden-bed-kit-8-x-8-x-20/?sku=RB88-RB88DFO&gclid=CjwKCAiApNSABhAlEiwANuR9YHSoWLHjbkeiPow1wNVkBvU_oCism43bHMf0NSPmY8Rp3rDrWToCbxoCzTAQAvD_BwE
What should we put underneath it in order to prevent it from sinking into the earth or otherwise being damaged? Cement? Dig out some of the lawn and put in woodchips?
(Let me know if this belongs on gardening instead, I'm not sure)