Secret strategy to win in the loading screen!
A lot of players might be wasting the sometimes lengthy amount of time they have as the game boots up, but I have a secret technique to improve my odds of winning that I use while you're waiting for that one guy who somehow installed League on his microwave. Instead of sitting their thoughtless anticipation, review the skills of the champion you selected. When I say review though don't think just about the ability description verbatim but analyze how you might use each skill in your lane match up and in teamfights later on. Also think about how your opponents my react to your budding strategy. Remember, you're playing vs other human beings and match making generally is pretty good at making sure your opponent is as crafty as you are BUT for best results its best to actually assume that you're always matched versus someone SMARTER than you. Think such as "I'm playing Nasus top vs Riven, as soon as we walk into lane I want to start Q and farm up stacks but she knows this and will punish me by spamming her Q and chunking me real hard. However if she does it in my minion wave she'll take minion agro when she uses her passive and the aoe will push the wave towards my tower real quickly. Our Udyr jungle is starting lower side jungle so he'll be in perfect position to gank when she pushes the wave to far and if she continues to use her Q for harass she'll be easy gank bait at the perfect timing for Udyr to come and kill her."
Something like that should form your overarching pre-game plan, now flesh it out with item builds. Some champions have flexibility in their starting items, so think about which of those item starts will best synergize with your strategy then how it would help you combat theirs. Think about what items you want in your full build this game by thinking about what gaps you have in their team and what strengths they have in the opposing team. Your the only melee champion who's not an assassin and the support is Nami and their team is playing Rumble, Amumu, and Xerath? You can plan on asking her when the game starts, "Can I build Locket so you don't have to? I'll have the money sooner as a toplaner, besides I would like the CDR it gives too! :)"
Games that you have a chance to form a game plan before you even spawn in will almost always go better than those you just "wing it" in. You'll waste less time in base figuring out your build, or aimlessly meandering in the jungle not knowing what the next step is towards victory, or just plain being distracted or not knowing the mechanics of a certain lane matchup and getting run over because of it. Big words you should use for yourself are "how" and "what if" and ask them constantly, never stop evolving your plan and adjusting it, and when the time calls be ready to adjust it to the live game because you won't always plan things out perfectly but that's ok, your opponent was also using Maximum Shyvana's Secret Technique and you should admire that this is a real battle of wits and not button mashing. Best of luck summoners!
(or make sure everyone on your team has a skin, if the other team doesn't then it's gg!)