Choose a level location with good sunlight
Measure the desired box size
Gather materials such as untreated wood, screws, drill, saw, and soil
Cut the wood to the needed lengths
Assemble the frame into a rectangle or square
Secure the corners with screws
Place the box in the chosen location
Add a weed barrier or cardboard on the ground if desired
Fill the box with a mix of topsoil, compost, and garden soil
Level the soil inside the box
Plant seeds or seedlings
Water the garden thoroughly
Maintain with regular watering, weeding, and mulching