I'm beginning to study pre-calculus. What are the possible topics I might encounter? Please help. I want to study them all, so it won't be bothersome for me. Thanks.

thanks for it all. 4/14/2020 update------ 2015 start date, that's 5 years down. I'm 18 now and cringing at my past answers. I'm also happy to see the regulars are doing well and mourning others.