For the last week we have been installing new raised garden beds to help the garden plot be more maintainable and to have more control over the soil. It is a fairly simple process, and there are many ways to create these beds, but the easiest way we have found is 4 steaks in the corners and 1''x6'' or 1''x8'' siding to fill in with dirt.
Here you can see the existing beds plus the space we added 2 more to.
Here I am placing my first post. it is just a scrap 2''x4'' that has one end cut in an A shape, to give it a pointy tip.
This is my method of driving the steaks into the ground although there are others that would also work.
Once the corner post is in you can attach the adjoining sides to the corner via nails, screws, etc. Repeat on all 4 corners and attach all 4 sides and you have a box. Now fill that with your dirt/compost/whatever you're using and you're good to go.
This is a raised bed that has been in use for a few weeks now, as you can see the onions are doing well. We hope to have quite the collection of different things growing this year.