I started by finishing Codecademy's Veneer project that I began last night. For the first time, I felt like I really understood Python classes. I was able to complete most of the first 20-something steps without needing to search for help.
I learned about nodes and linked lists in Python. It reminds me a bit of TiddlyWiki. I'm not totally sure if that's an apt comparison, but it seems similar. I don't really get what nodes and linked lists can be used for yet, but I'm assuming there'll be a project soon that will make it clearer.
I completed the Towers of Hanoi stacks project.