Hello guys i'm a noob with technology, I just installed Windows10 onto my SSD and had trouble booting it, after a long time of self troubleshooting i found out why:
I had to go into my BIOS and this category called "UEFI Hard Disk Drive BBS Priorities " to manually select my Boot Option #1 as my SSD. Apparently the normal booting sequence at the default/standard boot menu of BIOS doesn't work even if i select my SSD there.

Can someone explain to me why i need to go to this special UEFI menu to select my SSD so it can boot instead of just selecting my SSD from the normal boot menu? Thank you in advance

Extra information:
-I have 2 drives, 1SSD(as mentioned above) and 1HDD. Both internal.
-SSD contains Windows 10 (my main boot)
-HDD contains Windows 7 (Not in boot menu)
-Motherboard: MSI Z170A Gaming A5