A raised garden bed gives you better soil, drainage, and easier access than digging up the yard, and it's a great beginner project. A few choices upfront make it productive and long-lasting.
Size and materials
Keep the bed no wider than about 4 feet so you can reach the middle from either side without stepping in. Cedar resists rot naturally and is a popular choice; avoid old treated lumber and railway ties for food gardens. Galvanized steel and composite are durable alternatives.
Place it in the sun
Most vegetables need at least 6 hours of direct sun, so site the bed accordingly. Level the ground, and lay cardboard or landscape fabric in the bottom to suppress weeds and grass while still letting roots reach the soil below.
Fill with good soil
Fill with a blend of quality topsoil and compost rather than bare garden soil, which gives plants a rich, well-draining root zone. Deeper beds need more fill, so for tall beds you can add coarse organic matter or logs in the bottom to reduce soil volume.