Mapping one big landuse=grass, and then mapping buildings and paths inside it.
Or mapping the buildings first and then mapping the grass that’s around it. And if I use this method, should I map the grass until where it stops at the paths, and then make a separated grass area on the other side of the path, or map them as one area and then mapping the foot paths on them?
I assume this is the correct way doing it. With separated areas divided by paths (or foot/cycleways). It will be very time consuming, but if you enjoy the work, do it.