To provide more details, in the US and some other English-speaking countries, it is common to use the term "first floor" to refer to the level at ground level, while "second floor" would refer to the level above it. However, in countries like the UK, the ground floor is often referred to as the "ground floor" and the level above it as the "first floor".
Please note that this may vary depending on the country or region, so it is always good to confirm with local conventions when discussing specific buildings or locations.