If you need help with topography or satellite imagery, you could always find some random topographic maps online or go to Google Earth and look in places where there might be glaciers. Many times, you can find a lot of conventional examples, as well as some more intricate puzzles, which you can practice identifying and solving.
Also, read. Personally, I like reading online, since there are so many resources. Wikipedia is good, but only to a certain extent. There may be some other features not on Wikipedia but can be found elsewhere. Also, if you can understand the scholarly articles (theses, research, etc.), they would be great, but they are very detailed and focused so unless you're really into that particular aspect, try to stay more general. The more you read, the more you learn, and the more you cover, and you'll discover something new every day.
I'm not sure how much textbooks help, but if you can get one that focuses on glaciers, it would definitely be a really big help.
1st Fermi (2013), 2nd Astro (2014), 3rd DP (2014), 4th DP (2012)