Some random things I discovered for myself. Forgive me if it's general knowledge already. I'm still a bad player (silver 5).
1. You may or may not know this, but sometimes, when you have baron buff, taking a turret in another lane instead of a bare inhib is most likely the best way to do it. The reasoning behind this is that your minions won't be hindered in the bare inhib lane. While you pressure another turret in another lane, the enemy may defend it, and leave the bare inhib undefended to your minions. In case they decided to defend both, you can force a 4v5 at that turret, with baron buff to back you up. If they defend the inhib and leave the turret, well it's free gold and xp.
2. While playing as TF, rotate your cards and don't lock it in for it's duration. When you get closer to your enemy, they will most likely back off while it's rotating. Have fun freefarming as TF.
3. Don't be alone at bot lane around past 25 min. They will most likely hunt you, OR if your facing a team with actual brains, they will force a 4v5 at baron.
4. Mid assassins can't do shit when you push their lane hard into their tower. Best case will be their jungler will cover for them. If not, free tower.