Please don’t underestimate the value of Slide Share when you want to learn something. Visit the site, search using terms related to your topic (I believe I found this one looking for info on RSS Feeds, to be honest), and see how many presentations appear!
Depending on the topic, you may want to sort by relevance. For this topic, I wanted to search by latest. I actually viewed several shows that were quite relevant but woefully outdated (the boon AND the curse of social media, sad to say, is that it is constantly evolving).
If you are a visual learner (like me!), then this site is Your Friend.