What's the best way to attach a board to another board that's resting over it?
The rail is a 2x4 and it will be held, on each side, by a 4x4. Under the 2x4 rail I'll have another 2x4 that will keep the top 2x4 straight.
I only have a circular saw and a jigsaw, so, I can't do complex joints.
I forgot to mention that I have to attach these 2x4s to the 4x4 wood posts.