Hi Dan,
Groove Library is a series of tutorials I have done for YouTube and now it’s organized here as a “Free Pack” for all members of this community. Another “Free Pack” here is the Ghost Note pack you can find in the courses section and get started anytime.
The Groove Course 1 together with the Fills Course 1 are my two latest releases of 2020. You can find more info of these courses here:
Groove course – https://cajonmaster.com/groove-course-1/
Fills course – https://cajonmaster.com/fills-course-1/
Cheers!