Wow...I spent way more time on this than I thought so I really hope you read it and improve your play with it.
Here are some random tips that should help you out.
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Stop getting Duskblade every single game. It is only good on a few champs who can abuse its power by getting in and out of fights quickly to make use of its bonus damage. Crit provides way more sustained damage for ADC's which is what you want.
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If you already know this you can just ignore it, but using shift + click to attack when you play a ranged champ is way safer. Sometimes you can miss your target and walk right into the enemy. If you hold shift, you will automatically attack the closest target to your cursor removing the risk of casually walking into the middle of a wave or into the face of an enemy fighter.
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Lane control: Almost nobody in bronze know how to control the minion wave (if they do they aren't there for very long) so no one ever sees it and learns how to do it themselves. Lane control is a very important mechanic to increase your safety while denying your enemy both gold and exp. Lane control is a situational thing that just uses if/then statements for the most part.
If the enemy isn't in lane and you know they won't be for a little bit because they either just recalled your you just killed them, then push the minions under their tower as fast as you possibly can. Have your support help if you are playing ADC and don't worry about them taking a few cs to do so. As soon as this happens, you should go back to base and buy items every single time, even if you only have like 500g. The reason being is that as soon as the enemy gets to lane, all of your team's minions will be dead meaning they get no exp or gold and the wave will be pushing back towards your tower. This brings up the next condition.
If the minions are pushing towards your tower, then let them. Only last hit but DO NOT LET THEM GET UNDER YOUR TOWER. It takes some practice to get used to how fast you have to kill minions to do this. This is called freezing the lane. The enemy wave needs to be 4 or more minions larger than your wave for it to work. Always keep 4 alive but don't let them get to your tower. As soon as they kill your minions, your next wave should show up and the cycle will continue until you kill minions faster than your laning opponent or they kill them fast enough to push the wave to your tower. After you achieve the 4 minion cycle, you have to match the rate that the enemy attacks minions.
If you get a lead, do not push the lane. You may think that pushing minions under tower will deny farm, but doing the above section and freezing against an enemy who is behind makes it almost impossible to catch up. Don't go for kills at this point unless it is 100% guaranteed that you can kill the enemy because a freeze will break as soon as you go for a kill. This will push the wave back to the enemy tower giving them exp they would otherwise miss for fear of approaching your tower.
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Do not go for kills when there are minions to be killed unless the enemy is just playing stupidly. As soon as you win a trade, back off. Even if you don't get the kill, you still won lane by either making them play passively so you can again freeze lane or making them go back so you can push the wave under tower denying them that CS.
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Always have a control ward on the map. Even if you just buy one early and put it in your own jungle where it can stay without getting killed for 15+ minutes, it still helps a lot. You should always get one on your first back unless you only have enough gold for your core item. If all 5 people on your team always have 1 on the map, it makes it very difficult for the enemy to gank. Remember to replace it on your next back when it gets destroyed.
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Change your trinket at level 9 unless you are a middle or top laner. ADC's should get farsight alteration to safely ward bushes from a distance before face checking them. Some middle laners can get it too, but most mids have some kind of defensive tool to get out of a bad face check. Supports should switch to sweeping lens as soon as they buy sightstone for obvious reasons. Jungler should switch to sweeping lens when it is no longer necessary for them to help ward or after they get the tracker's knife.
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Just don't be stupid. There is a lot to this one, but here are the big ones.
If the enemy is all missing and you expect that they are doing baron or dragon, don't try to stop them by yourself unless you can safely attempt a steal from over the wall. Walking up to try to steal in the middle of 5 enemies works maybe 5% of the time and results in your death 99.99% of the time. Even if you steal, you die leaving your team at a disadvantage for the coming defense.
Don't try pushing a lane when you can't see any enemies unless you are doing it for a reason like splitting bottom with teleport to either tp to help at baron if the enemy shows up or for your team to get it for free if the enemy comes to kill you. In this case you let them kill you to get a free baron. You should only split if you can see 3+ enemies on the map. As soon as they go into the fog of war, stop pushing.
Do not tower dive early in the game. It only works probably about half the time anyways. Going back to the lane control section, if you can't safely kill them, let them back and get a cs lead while they are in base. The risk of a tower dive far outweighs the reword. If you are thinking of diving, you probably already have a lead and possibly even a bounty. A kill on the enemy could get you 200g and a death gives them 400g. It mathematically doesn't make sense to even try it. The enemy also has the minion advantage. If you kill them, they miss the cs they would have missed if they went back anyways. If they kill you, they get the gold from killing you as well as more cs than you would get if you killed them because the minion wave is bigger.
