Hacker

So my facebook page was hacked a few days ago. Suddenly "I" was posting about weight loss supplements and free macbooks. People were texting me & messaging me to let me know I had been hacked. One facebook friend (whom I haven't seen or talked to in probably 25 years) even posted on her own wall, saying "NANCY BRANDT HAS BEEN HACKED! PLEASE HELP HER BY REPORTING THIS TO FACEBOOK!" After a few days I figured out how to report it myself and ended up changing my password which I HOPE solves the problem. I still don't understand how it works. Is it a single person going directly into my account? Or is it some virus-y thing that just kinda happens? I wish I had a deeper understanding of how computers and the internet work. Unfortunately I am more of a creative type and so technical processes like that DO NOT stick in my brain...unless I'm writing about them for an assignment. Maybe that's what I need to do!