Some of the key concepts in geophysical fluid dynamics, the details of which could be found in Baylor Fox-Kemper’s EEPS 1820, Joern Callies’s course notes for ESE130, ESE131, Geoffrey K. Vallis’s textbook Atmospheric and Oceanic Fluid Dynamics. I personally also found Baylor’s Youtube channel videos on GEOL1820 and Nick Hall’s GFD course videos very helpful when I am learning GFD. A lot of other materials/textbook are very useful, but I am not listing as I did not read.