Skins
Skins can be obtained via the skin Shop, gacha or events. Skins costs an amount of vouchers in the Shop and vouchers can be bought with cash via GooglePlay, AppStore, etc. Skins are purely cosmetic and will not boost any special stats or benefits to your hero in game.
Monsters
Make sure you constantly check up on the giant monsters that live near the top and bottom lanes as letting the enemy defeat them will give them a huge advantage.
Store
If you are not sure what item to buy with your gold and don't want to navigate the entire store you can always tap one of the recommendations which appear beside the store icon once you have enough gold to purchase them.
Communication
To be successful at Arena of Valor it is important that you have good communication with your teammates. As there are no vision totems you should always try to ping your allies or write to them if you notice an enemy or an enemy dissappears from your lane.
Outnumbered
When you find yourself fighting against two heroes alone you should at least be three levels higher than your opponents to have a chance of winning. Even if you do manage to defeat them you will find that you will be severely wonded. It is more beneficial to avoid those type of confrontations and battle against heroes where your team has the advantage.
Upgrading
Unless you are saving up for an expensive item you need to make sure you upgrade you gear with the gold you earn in matches whenever possible so you become more powerful.