League of Legends: How To Play League Of Legends? Get Your Basics Right 

Items and Shop:

property of LeagueOfLegends/Riot Games

Each player has access to a shop located in base. The shop has a vast variety of items which shapes your game style. You can buy these items via the gold you get from killing minions, neutral monsters or enemy champions. You also get gold uniformly through out the game even if you don't kill enemy units. The faster you get items the more stronger you become in comparison to your opponent. You can buy bits of a single item which can later be converted into a whole item once every bit is purchased or you can buy the whole item at once if you have enough gold.

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XP:

As the game progresses you gain experience for doing different things such as killing minions or enemy champions. These exp points are used for gaining level. When you gain a level for example from level 1 to level 2 you can add a point to an ability for unlocking it or making it more stronger. You can go up to level 18 at maximum.