Hello, I'm a newbie when it comes to magic so I'd be very grateful if someone answered these questions for me. Is anything from what I'll mention below possible to be obtained by magical means: having a dream about something a person wants to know (for example alternate way your life would go if some things that happened in the past didn't happened), erasing certain memories from the past, or at least negative results they caused (like when someone was abused), getting knowledge about any subject person wants? I hope for reasonable and serious responses about possibility of these things or at least something close to them happening.
1. You can dream such things through spells that revolve around lucid dreaming (which is hard to master) or falling asleep with a a specific intention (which is a hit or miss kinda thing).
2. Memory erase is more of a psychological or scientific kinda thing but there are ethical ways of dealing with bad memories without actually being heavily involved in the scenario it self with the right kind of ritual. I'll leave that to you to figure out.
3. Getting knowledge about something? Yes, it's called divination (or at least these forms of skills fall under divination).