Hiya Eugene!
I'm not much further along in the same journey and I'm slowly working my way through the course you mentioned here too -it seems really fantastic. . I've already gone through the course book from Davinci and thought it was a pretty great starting point.
I'd say if you can understand and follow along easily then carry on. If you feel a bit out of your depth hit up Davinci's course and see if it's a better starting point for you.
https://documents.blackmagicdesign.com/UserManuals/DaVinci-Resolve-16-Beginners-Guide.pdf?_v=1585613270000