Good. A SATA device has two connectors on it. The wider one with 15 contacts is for power input from the PSU, and the connector for that is on some of the wires directly from the PSU. The narrower connector has 7 contacts and it's for a data cable that runs from the drive to a mobo SATA port.
Your mobo has two slightly different groups of SATA ports on it. See the manual, p. 12, items 10 and 9. See also pages 15-16. The main ones you can use any time are the group of four shown as item 10. Then item 9 is a group of two ports called ASATA. These two only share some mobo resources with any SSD you have installed on the mobo in its M2A socket. So IF you have an SSD installed, do NOT try to use either of the ASATA sockets for drives. If you have NO SSD in the M2A socket then those ASATA ports act like any other SATA port.
I note that the four SATA ports in item 10 all have their opening facing the front edge. Depending on what else is in your case near there, you may be able to use common SATA data cables, OR you may need cables with right-hand connectors on one end to fit into a small space there. Common SATA data cables typically are supplied with a case or sometimes with a mobo. If you need any, check with any computer parts shop. IF you need ones with a right-hand angled connector, there are "left"and "right" versions of those, so ensure you get the one that fits on your ports.