To add to this, due to OP's comparison with electrons orbiting a nucleus in 3D space: where planets and other materials in space all PULL on each other due to gravity (don't ask what gravity is, IDK, okay? Nobody knows!), electrons PUSH on each other, they repel one another. So they get pulled in by the nucleus, but when they come to close to each other, they start repelling one another, and thus they can end up in seemingly 3D orbits, because this allows them to be the furthest from each other.