It used to be that if a young lad --- or lass, for that matter --- wanted to know how to connect two pieces of wood together, he --- or she --- could take woodshop in school and would learn all those handy little tricks. Nowadays, however, woodshop is becoming a thing of the past, and the young minds of America find themselves at a loss at how to accomplish such a task. Fortunately, as you might have guessed, it is a relatively simple thing to join two pieces of plywood together, and can even be accomplished in a variety of ways.
Align the two pieces of plywood how you wish to join them together.
Place against the plywood so that, when you drive the nail through, it will go through the first board and into the second.
Use your hammer to pound the nail through the plywood.
Take another nail and drive it into the plywood a little ways down from the first nail, but still so that it penetrates both boards.
Repeat these steps until you are satisfied with the stability of the two pieces of plywood.
Start at the edge of the first piece of plywood and draw an unbroken line of glue from one edge to the other where you plan on connecting the pieces.
Push the second piece of plywood firmly against the wood-glued piece and hold it in place.
Keep the pressure on the two pieces of plywood, then use your C-clamps to press the two pieces together and continue the pressure so you can release your grip.
Leave the two pieces held together with your C-clamps for five hours to allow the glue to dry.
Place the two pieces of plywood together so that they are lined up how you wish to connect them.
Use your drill to drill several small holes that go through both pieces of plywood. These holes should be all along the portion you wish to connect.
Place into the first hole and use your screwdriver --- or replace the drill bit with a screwdriver bit in your drill --- to screw it into the plywood using the hole as a guide.
Repeat Step 3 for each hole in the plywood.