One day, as I knitted my first pair of socks, I decided that I didn't know enough about sock heels to make anything wearable. I searched and searched for sock heels on the internet, but all the sources either a) were tiny fragments of people's knitting blogs, b) without any pictures (learning knitting is a very visual thing for me, or c) without any guidance.
I wanted to make a dictionary of assorted sock heels, how they look in assorted sock patterns, and detail with my camera in hand the process for knitting each heel, on its own and with a sock, perhaps.
This will take me a long time. Consider it an ongoing project.