Q.pH Levels
How do you check pH levels and what do you do if they are off?

Certified GKH Gardening Expert
To check pH, you need to do a soil test. You can either have one done at your local extension service or you can buy a test at a local plant nursery.
These articles will help you with correcting your pH, should it be off:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/raise-acid-level-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/lower-acid-soil.htm