How do u make a fishtail braid and what hair styles does it work best on?

It's easiest with long hair or wet hair. To make the braid you first make a ponytail and split it in two sections. Hold the sections apart and take a small section from the right half. Cross it over to the left. Now take a section from the left and cross it over to the right. Repeat, each time taking a new section. The braid looks best if you use small sections and keep it very tight. It will take some practice to make it look good.

How do u make a fishtail braid and what hair styles does it work best on?

That's really hard to explain, but I can tell you that it works on most hair styles, but they pretty much need to be straight and somewhat long.