SATA motherboard help

It means that if your boot drive is a HDD then connect the drive to port SATA3_0 or SATA3_1 or SATA2_2 or SATA2_3 or SATA2_4 or SATA2_5 for best performance.

Since your boot drive is a SSD then you can disregard that note.

Connect your SSD in AHCI mode to port SATA3_0 or SATA3_1 for best performance.