[quote=Rare]
This might seem dumb, but what roles are there? I never have played anything similar to League of Legends, but I had played multiplayer in Battlefield 4 and Team Fortress 2. Is the roles similar to the ones in Battlefield 4 and Team Fortress 2?As for 'laning and farming', are they similar to spawn camping in Battlefield 4 and Team Fortress 2?
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TF2 is what I could see fitting better in terms of roles and dynamic gameplay. You have (in TF2) Heavy, Scout, Pyro, Medic, Sniper, Engineer, Soldier, Demo-man and Spy.

In League of Legends, you have Assassin (champions that are often equipped with abilities that renders them invisible), Fighter (champions who have high resistance and high damage value), Jungler (champions that are fighter-like, but often go to the Jungle section of the game), Mage (champions who have powerful magic attacks that are able to chunk away enemy HP), Support (champions capable of assisting the team or laning partner through heals or crowd control), Tank (champions who have the ability to withstand huge amounts damage) and Marksman (also dubbed 'adc' or 'carry' in the community, champions who rely on heavy auto attack damage with high physical damage).

Laning and Farming are one of the key essential things in a match. Laning is a phase in the game where champions are divided up into three lanes of the game, they are Mid, Top and Bottom (abbr. Bot). They push (bringing minions to tower and damaging enemy's tower) and harass (constantly dealing damage to the enemy to prevent them from farming) the enemy champion who is in your lane. Typically, fighter-like characters go to the Top lane. Mages often go to Mid lane and the Marksman and Support go to Bottom lane. Winning your lane involves not just the amount of kills you get out of the enemy team-- it's also the amount of farm or minion kills you have.

Farming in the game is part of the laning phase. Farming is when you harvest gold from either the minions or neutral monsters in the jungle (although you probably want to leave that for your Jungler). When you successfully kill a minion, you're awarded with a fixed amount of gold. 10g for Melee Minions and 15g for Ranged Minions and 39g for Artillery Minions. During your first time playing the game, you'll probably have a hard time getting minion kills. There is one way to avert that issue-- One method that pro-players also use is a method called 'last hitting'.

Last Hitting is the act of killing a minion with one hit-- thus requiring good timing to execute. The trick to last hitting is to be patient and let your minions do all the work in bringing the enemy minion's health to low and then killing it. You have to pay attention to how much health you take away from the minion and do your guess there.