Raised bed gardening is a great way to raise vegetables. I have a few tips that might make building your raised bed(s) a success.
Location is of utmost importance. A plant bed for summer crops wants eight hours of direct sunlight for maximum health. The place where you build should be level and near enough to the water hose. Some beds are temporary, such as those made of straw bales, and others are very permanent like a cinder block or brick type. My beds have always been made of 2×6 lumber.
With the location of your bed picked the first step in construction is to prepare the soil under the bed. I suppose that you could build a raised bed upon gravel or even concrete but I have always had lawn to build over. Since you will be adding soil to give the bed is height and growing medium, the sub soil is not of great importance. It should, however,be prepared somewhat so that it can aid in water drainage and potentially a root bed for the longer rooted plants. By simply raking or digging up and turning over the existing soil, there will be a pace for water to drain out .
The bed size should be so that you can access the inner portion of the bed from the outside. If you plan to be able to walk all around it, then four feet wide is good. If it is against building or fence,then three feet wide is plenty. Stepping in your bed is not advised during the growing season due to the compacting force that you will apply.
Screws, drill and drill bit are the hardware that you will need to make a bed like mine.
The lumber comes together in the corner of the bed and the boards can butt against each other. When the 2x6s are up on their narrow 2’ side they create six inches of raise which is perfect for most garden plants. Two screws per corner should hold your soil.
Last step is to fill the bed with soil up to the boards and plant! Erosion may be a concern if the bed is not level, so planning ahead for this is wise. Using a level, or you eye, make sure that the boards are level with the world and that the soil inside is level with the boards.
At the end of your first season growing in the new bed, it is important to check the corners to see if they have pulled apart at all. Some repair might be needed, but since you built this thing, you can be creative with the future use of it.