That is a pattern only. Click on the view item tab and you will be taken to the "suggested" supply list. You and buy the fabric and floss at the same time. You are not "required" to do so. Scroll down on the floss list and you will see the number of skeins you need. Notice that some colors (like black #310) will need more than on skein.

There are 91 colors I need all of that?

You need what is listed . Some colors require more than 1 skein. As for the fabric you only need to pick one of the three suggested. Hope this helps.

The designer "suggests" the listed flosses. You don't have to buy all of them new. If you already have a floss collection/stash of floss you probably already have some of those colors. You can cut back on some floss buy eliminating some of the shading. If you are buying for the firs time; sign up for the newsletter. You will receive a 20% discount on your first purchase. Are you new to cross-stitching? The is not a good project for beginners.