Second, third, fifth and second are correct.

1, {0} is also a set with element 0, and an empty set is a set without element. 2. An empty set is not equal to a number, and neither is a concept. 3, empty set belongs to any non-empty set, concept. 4, the empty set has no elements, and naturally it does not include 0. 5, do not explain,

If you don't understand, please ask. If you feel good, please add points.