Like I heard that if you get all your high school credits you can graduate high school earlier. How do I do that? And what is an ap course?

AP = Advanced Placement, taken in high school so you don't have to take a similar course at the college level.

You need to talk with your high school to see if this is even possible, to graduate early.

Speak to your counselor. It will be difficult to finish your credits early unless you attend summer school,or maybe junior college (if the classes transfer). AP classes require that you pass exams with minimum scores to be accepted at the college level for credit.

Much depends on your school and your counselors. When I did HS in three years all that was needed was sufficient credit.

AP courses can get you college credit in some courses and some states. Though not all courses. AP HS chemistry, for instance, in California only allows you to test into a college chemistry course ( chem 101.) and is strongly advised against by college instructors. They want you to take intro chem at the college level.

Other course, such as math, ( for some strange reason ) social science and humanities transfer easily