The T joint is the simplest joint to make, where a side meets a cross piece. The cross piece must be cut exactly to form a perfect flat, square base. Place the piece onto the flat piece and nail together. Try to nail from the surface of the flat piece into the cross piece. For extra strength, slant the nails to form a dovetail.
If you have to nail the cross piece down onto the flat piece, more care is needed when hammering to avoid moving the cross piece out of line. Hammer from both sides of the cross piece into the flat piece to avoid the structure slipping.
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