howto: picking up a dropped purl stitch

so i’ve recently picked up knitting and the thing that I mess up the most is dropping stitches when purling. This website gives the following instructions for picking up the stitch:

To retrieve a dropped purl stitch, insert the right needle through the loop, and under the strand.

Insert left needle from front to back, and lift stitch gently over strand.

The strand thusbecomes a stitch facing the wrong way.

Slip needle into loop and slip stitch to correct position for purling.