Muddiest Point?!

I could name so many muddiest points during this unit but I think the first thing that comes to mind when I think about my muddiest point, it has to be... food webs. You might wonder... what about food webs? I think reading them is what I have trouble on. For example, finding out the primary consumers, or like the 2nd trophic level. All the arrows and pictures confuse me sooo much! HELP.