How to level up your trainer in Pokémon Go

How do I level up my trainer in Pokémon Go? You can't expect to be the best trainer in your city -- let alone the world -- if you're stuck at level one! In Pokémon Go it's not only important to raise the Combat Power (CP) of your Pokémon, but you also need to raise the level of your trainer. Why is my trainer level important? How do I increase my trainer level in Pokémon Why is my trainer level important? Raising your trainer level enables you to find stronger and rarer Pokémon in the wild,...