Knowing all these, you shall be able to fold from most of the existing diagrams. Lines Valley-fold line. Arrows Valley-fold arrow. Fold and unfold arrow. Grab the paper where the the white dot is and move it to the direction of the arrow.
Symbols Turn the model over to the direction that the arrow shows.
Rotate the model the given degree clockwise or counterclockwise. Push the paper here. Place your finger here. Repeat the given range of steps. Repeat in both horizontal and vertical mirror image.