The dragon is another one of many basic figures and additionally it is one of the easiest origami figures because it needs just three easy steps of folding as you can see below:

Step #1:
First do a diagonally valley fold and unfold it again.

Step #2
Fold the left corner to the valley fold in that way so that the edge below the corner rests exactly on the valley fold. Don't unfold it afterwards.

Step #3
Just redo step #2 but with the right not folded side of the piece of paper. Please note, that the two corners are at the same height after folding the last two steps.

That's it,the basic dragon form is created.