It can be confusing, so it’s best to bring in an electrician as wiring things incorrectly can create a fire hazard.
Wiring is done differently in different countries, so it’s often confusing to look at examples from somewhere else.
But ground is not neutral.
The neutral is the “return” portion of the electrical circuit. Electricity coming into the house typically starts at the circuit box. In US terminology (again, other countries are different both in wiring and in terminology) It runs along the “line” wire to a switch. This is also sometimes called the “hot,” particularly for light switches. (This is called the " common" wire in the UK, or sometimes the " supply").
At the switch, the line comes in, and the “load” goes out from the switch to the device that is controlled by the switch. ( in the UK, I know the load is often called the “fixture line,” I’m not sure if there are also other terms for it but there probably are. )
The “ground” (called “earth” in the UK) is an additional wire that runs from the switch to a point that is used sort of like an overflow if there is a problem on the circuit.
The “neutral” is a wire that runs from the device And/or The switch back to the circuit box. That’s what completes the circuit.
There is always a neutral on the circuit somewhere, but it might not start until the end device like a light fixture on the ceiling.
A plastic casing may hold more than one wire
In many countries, but not the US, the ground and the neutral are typically wrapped together inside one cable casing, making them look like one wire when they are actually two. Again, US wiring is different. So this is why in some countries people will use the term “neutral cable” or “earth cable” when they mean the cable that contains both a neutral and an earth wire. Obviously this can be confusing to beginners.
wire Colors are standardized in many countries, but not in the US
In Europe, wire colors for residential buildings have now been standardized, and blue is used for the neutral. In the US, White is usually used for the neutral and black for the line and the load, but the colors are not mandated by law and people can and do use any color wire.
But again, consult an electrician for any specific wiring questions.
With regards to 220 V devices and a US frequency smartthings hub, there are a couple of topics in the FAQ section of the forums that discuss this:
And a topic specifically on neutral versus ground:
FAQ: Neutral and Ground Wires are not Interchangeable
@Navat604 or @dalec or one of the other electrical experts can correct me if I’ve gotten any of this wrong. It can certainly get confusing, especially in an international forum!