TIPO DE SSD COMPATÍVEL COM DELL INSPIRON I15 5566 D30P

Dell Inspiron 5566 contains only a single drive bay, so you can use only one internal drive, either hard drive or SSD. You may choose any 2.5" SATA SSD up to 9.5mm in height, and can go all the way to 4 TB if you want. Here are some Crucial SSDs that are compatible with your laptop, though you may buy any brand you want.

If you really want two drives, you could buy an adapter/bracket that lets you install a hard drive or SSD in place of the optical drive. 

Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard. (Repeatedly touching a metal case part is not sufficient mitigation with modern components.)