What you wrote are all right, but there are only differences between their tenses.
The simple present is used:
1. to express habits, general truths, repeated actions or unchanging
situations, emotions and wishes: I smoke (habit); I work in London (unchanging situation); London is a large city (general truth)
2. to give instructions or directions: You walk for two hundred metres, then you turn left.
3. to express fixed arrangements, present or future: Your exam starts at 09.00
4. to express future time, after some conjunctions: after, when,
before, as soon as, until: He'll give it to you when you come next Saturday.
BE CAREFUL! The simple present is not used to express actions happening now. See Present Continuous.
Student or Learner