Raised garden beds are fairly simple to create with minimal carpentry skills. One of the advantages to using fir lumber for such a project is it's aesthetically pleasing pinkish-white coloring. Leave it raw or use a clear finish, or stain or paint, as you prefer. Fir lumber is also somewhat rot resistant, making it desirable for outdoor use, more so than many other lumber choices. When choosing fir lumber, look for a straight grain for less warping.
Mark off the area for your fir wood raised garden bed with the tip of your shovel. Turn the soil by digging it, one shovelful at a time, in the marked-off area.
Saw two boards the same size for the front and back of the raised bed and another two boards the same size for the two sides of the bed. The width shouldn't be wider than you can reach to the middle, from one side or the other.
Place the boards in a box shape.
Use the drill, screwdriver attachment and rust-resistant screws to connect the box shape. Screw through the front and back boards at the ends and into the sides of the shorter, end boards. Use about five to six screws at each end.
Place the wood box frame onto the garden location.