Everything you ever wanted to know about airfoils and their aerodynamic properties, all. interactive visualized on this great site.
A fun read, probably one I will hopefully come back to in 10 years, and it will still be relevant:
Great read on the underlying fundamentals of vectors in a software context.
As a visual learner, this site does a great job at breaking down a very small and complex device, into easily understandable chunks to get a overview of how each part contributes to the system.
Here are a few random things to do …