While there is an infinate amount of information out there, and way too much to absorb one thing you could do is come up with an idea that is new and novel that can teach something to others. Like in philosophy there is really a dialogue. One philosopher will say something, another philosopher will refute the original author long after the original is dead, someone else may come in and elaborate on the original idea in defense, and someone else could come in with a new view that puts the two together, and so on. You could extend the dialogue that goes on in the professional world. There are a ton of debates in the religious sector, philosophy, sciences, engineering, economies, world affairs. Or you could try learning everything about something in particular and become an expert, or learn everything about everything. But whatever you do learning is fun.