This is a delicate and different point, I love it. Get your crochet needles and let's learn this stitch for free.
This crochet pattern can be called a shell stitch, too. You have the pattern and a video to learn.
With this wonderful pattern, you can make various handmade pieces like tablecloths, scarves, blouses, dresses and many others. This pattern is very simple, but some people have trouble reading the graphics, see here how to know the symbols of each stitch, a good help for the graphics.
The shell stitch is any pattern in which multiple double crochets are woven into the same stitch. There are simple versions and others more complex
To knit this stitch, you will need to check how to make a chain, half stitch, and double crochet. If you don't know any of these techniques, do a review before trying to knit the fan stitch.