I've been wondering about some of these things myself, and this had helped me a lot. One final question I personally have, is: Is it always better to buy each part of an item, ex: In Trinity Force, should I waste time going back for the Sheen, Zeal, etc, or just save up for the TF itself, and then just buy it? And also, when someone says: "Build Frozen Heart, or Randuin's Omen", does that mean but all items leading up to that, and it be my main final item, or?
I'm also trying to understand how to make builds for myself. (If anyone is willing to give me a few good examples, I usually look at 3v3 AD Builds for Wukong)