Why do I dream things I do not know and then after...

Praise is to Allah. We seek refuge in Him. He is not misguided. He who is guided by Allah no one shall mislead him. And no one shall guide a misleading person. I testify that there is no god but Allah, who has no partner and that Muhammad is His servant and His Messenger.
My honorable customer,
What is forgotten by the human events in the vision is usually has no significance, especially if forgotten by the first person to wake up, unlike whether forgetting because of the duration, it may be a vision may not be, and that you wake up from a dream and forget what you saw, this indicates that it is not a right vision, it may be a talk of the soul.
As person if thinks about something then he will dream about it. You have not to care of these dreams and increase duaa and ask Allah to guide you the right way .
As prophet Muhammad PBUH said that “Dreams are of three types: a good dream which is glad tidings from Allah, a dream from the Shaytan which causes distress, and a dream that comes from what a man is thinking of to himself, and if someone saw a good dream then tell others but if it was bad dream then don’t tell anyone”
I ask Allah to guide you to what He loves and pleases, and to go beyond the evils of your deeds and to enter us and you in His mercy.
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Kind Regards,