Here is the video I put together years ago that explains what the 'CAGED' system is. It's been on YouTube for many years and has accrued over 5 Million views! It's worth another look, I reckon. It's a huge lesson.
Of course, understanding what it is and knowing how to put it to use are two different things. If you want to find out how useful and how powerful this is, click on the link below.