Learning about hockey history and blogs are a nice way to do it because they're well written and contain pics/links fairly often. Here are the ones I've found so far, feel free to mention and I'll add them here.
A subsection of the Backhand Shelf blog not updated as often but my favourite one in terms of how it's a bit general and has a good writing style. The author became a hockey fan post-lockout so she shares what she's learned as she goes along which I like. She also has a past blog called theoryofice (which includes a list of legendary hockey games but unfortunately many of those aren't or have been removed from public youtube).