Usually white is ground and that looks connected. Check the wires for voltage. Plug in and check again. Unplug and start the engine and check one more time. If you find 12+ volts connect to the positive terminal.
The rest you can leave off until you discover something does not work. The two on the left look like could be additions by prior owner. The right hand looks more OEM.
All wires should have a fuse within 18" of battery.
Verify the battery is getting a charge when you are plugged in or when the engine is running.
The 12 Volt Side of Life+1 for adding a tie-down.
