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I'm new to licenses and don't really understand the difference between the license choices on GitHub.
If you license your own work under the GNU General Public License, does this mean you wouldn't be able to use the code again in a closed source commercial product you own?
Absolutely.
If you own the code, you can dual-license it, or do whatever you want with it.
Just be sure you own all of it - i.e. that you haven't incorporated someone else's copylefted code into it.
When you write code, you automatically have the copyright on it. It's then up to you how you license that for use by others. The only restriction you really have is that you can't revoke a license once you have issued it.
If you own the code, you can do what you like with it.
In other words, you can absolutely licence under GPL and implement it into a commercial product you own.
The only real gotcha is that if you use anything you've not written to implement your code, then if this uses a licence such as GPL, this could potentially contaminate your code.
A decent explanation is here: http://oss-watch.ac.uk/resources/duallicence2
