Processor Components and Peripherals - Processor Components and Buffers
This is a difficult topic. At this point you only need to know the definitions for Processor Components. If you want to understand it then look at this animation and see if it helps
http://www.hartismere.com/Subjects/IC...
Be aware that it contains content that you do not need to know.
The buffers you do need to understand so try to learn the steps that occur when the buffer is used when transferring data.