Please explane to me, whoever you are, when I use did (verb) and when have (verb) in Past tenses?
It depends on what do you want to express.
Past tense of the verb have ist: had
Past tense of the verb do is: did
Examples: I had no choice. I had a garden in front of my house.
Examples: I did the singing. What did you say?
Maybe you are confused by the past tense negative?
Examples: We did´nt have flowers. I didn´t do the singing. I didn´t say anything. I didn´t have a choice.
Maybe you are confused by the fact, that the word "have" is used as an auxiliary verb sometimes (but in present perfect tense, not in past tense): Example: He has finished his exercise. You can also say: He did finish his exercise. But the meaning changes.