>>2926518
It's worth learning a few joints. That said my most commonly used joint right now is a very basic crossed lap joint. I also finished a project where I used 1/4 inch wooden pegs in place of nails.

In specific applications like boat building or areas of high humidity like in Japan nail-less wood construction is still favored because it avoids the issues of rust associated with using iron nails. Using wood dowels of the same wood as the planks reduces rot.