not understanding the gift system to make sure I had enough friends who could give me each of the four items everyday (and making sure I was sending out each of the 4 types so that I received each of them)

Not recognizing who the fast trainer was on my season one squad. And when he was injured for 5 days, I should have healed him so he could continue earning skill points and training so that he could be on my squad for the maximum number of seasons.