Just a few I've found so far that help a bundle in the learning curve so thought it might be nice to share for others. I have no affiliation whatsoever with any of these.. they are simply helping me learn.
Feel free to add more you think will help us all
Integrate Staticman with Jekyll
a little old but this series by Thomas Bradley is great:
Another great series.. You do need to sign up to watch the whole series but it is free at this time - for 10 days.. after that you will be charged..
However.. what you can do is sign up.. view the vids.. view source and save the vids.. then just set the subscription to expire and after 10 days there's no charge.. ahem..