u/Illustrious-Chest-52

So, when I was a kid, I used to be really obsessed with space (as most kids). This year, around my 25th birthday, I started feeling sad I lost a connection to something that made me so happy, so I decided to pick up a sci-fi book. Long story short: I have an idea for a sci-fi book on my own, but need better understanding of astrophysics, so now I am looking for a "crash course for dummies". Any books, articles, online info, would be helpful. I am specifically interested in dark matter.