Hello!
My Nissan Cube 2011, oil pressure light comes on when I'm in idle.
When the car is rolling on the road it's ok, but when I come to a stop sign, red light or when I brake and the car comes to a complete stop, the light comes on, but when I start rolling again it goes off. The oil in the car is ok, and I always have my oil changes done. Please, can anyone help? Thank you.

If there's no check engine light then there's a good chance you just have a bad pressure switch. When the oil pressure is actually low, the EOP light will usually be accompanied by a lit MIL and IVT codes like P0011. The switch isn't difficult to get at on an MR18, it's on the front of the block just above the starter motor. If you DIY it, checking the pressure would require pulling the switch anyway, so rent a mechanical gauge from AutoZone or wherever you get the switch and check pressure while it's out. Spec is 9 psi minimum at idle with the engine warm, 29 psi @ 2000 RPM.