I'll second this. Wikipedia is a great resource for this stuff. Also, check out some of the common frameworks like Porter's 5 Forces, SWAT analysis, BCG Growth

I'll second this. Wikipedia is a great resource for this stuff. Also, check out some of the common frameworks like Porter's 5 Forces, SWAT analysis, BCG Growth-Share matrix, and the GE-McKinsey matrix. There are a lot of free educational materials on these. I'd take it slow and steady, and try to focus on orienting your thinking to the questions asked by these frameworks. Also, consider reading the Form 10Ks for some companies whose products you like. They have a section where they explain their market and their role in it. Good luck!