R or r = right hand
L or l =left hand.
VIDEO: Watching the video may help. Don't worry about doing this perfectly for now. Just try to understand the rhythmic relationships between each of the note values. Try to gain the ability to recognize them in the music playing around you every day and eventually call the various values by-name as you hear them. We'll study these concepts again as we study fills. BEGINNERS SHOULD NOT WORRY ABOUT BEING ABLE TO DO THIS PERFECTLY. It will come to you gradually as you study the other lessons of the course. Understand the concept . . . then move on.
Remember! We're only human. The tempo will need to be a bit slower to accomplish these faster note values. Understand them, then move on. Speed and perfection will occur as you jam, and continue through the other lessons of this course.
The following E-book explains why dotted-notes were created, and why they could/should be eliminated completely from the current note-value system of reading/writing rhythm. You should check this out. It's an in-depth, provocative, compelling, new, and comprehensive study of this topic. You'll come away from it as a rhythm guru!