Nearest us - USB, Power, Power & Power. 3 connection options depending on how you intend to power it.
Left side - CAN Bus header connector, and what looks like a cooling fan power connector.
Wow, didnt know that its so featurerich... and all 4! power connectors are for cables that goes horizontal right? The left 3 for sure but im not sure with the right one. But i guess the second right one would be the one to use with a ATX-PSU.
The big white connector in the middle is 6-pin PCI-E connector, which is the easiest connection option with ATX-PSU.
Green chimney seems to me like simple screw terminal.