I'd estimate this is number... 5? Let's go with 5.

I learned how to hash passwords in a database for a program I'm working on. I also seem to have figured out a decent way to stop your basic SQL injection (that is, SQLMap doesn't think any of the fields in the form are injectable), in which I convert the incoming text into a string of ASCII values (e.g. "Hello, world!" becomes '72 101 108 108 111 44 32 119 111 114 108 100 33'). Unfortunately, the SQL library I'm using doesn't automatically escape strings in prepared statements, so I had to figure out a way to do it myself. Messing around with technology is fun.

Update on that program: I have now successfully set up the ability for a user to have a single plain-text document which they can edit. (The ultimate goal is to be an open source equivalent to Google Docs [the online documents, not the file storage], but that's a long way off, and I'll need to learn a lot more before it gets there, and hopefully get some contributions from others.) https://github.com/QPython1000100/webdoc

Well, I got out of work on time. Woohoo!