Overview of CAPM & PMP
CAPM is an entry level certification for people who are working in projects. It is a knowledge based test based on the PMBOK Guide. If you study hard, you can easily pass the exam. You need to study PMBOK Guide and learn about the processes & ITTOs.
PMP is an advanced level certification for people who are managing complete project or part of a project i.e. they have experience of leading & directing projects. PMP is mostly based on the PMBOK Guide but not entirely on it. It is based on Project Manager's role as defined by the PMI. PMP tests the aspirants on the application of PMBOK Guide's concepts (Processes & ITTOs) and hence it is much more difficult than CAPM.
There are 2 ways to fulfill the requirement to appear in the CAPM Exam -
Option 1 - You need to have high school diploma or global equivalent with 1500 hours of professional experience on a project team
Option 2 - You need to have high school diploma or global equivalent with 23 contact hours of formal education.
You can gain contact hours by doing an online course. I would recommend that you should look at some top courses on udemy. Udemy courses are reasonably priced and you get lifetime access to the course.