Here is a list of the most commonly repeatedly asked questions. These are almost all related to technical issues that people are having with the game.
Pokemon Go login issues after updatePokemon Go login issues after update
Is it possible to log back into a Pokemon Go account?Is it possible to log back into a Pokemon Go account?
Does it make a CP difference if you feed candies before or after evolving?Does it make a CP difference if you feed candies before or after evolving?
Why are there no Pokémon near me?Why are there no Pokémon near me?
I can't play Pokemon GO! What's wrong?I can't play Pokemon GO! What's wrong?
My Pokemon go account has resetMy Pokemon go account has reset
Forgot login credentials, can I look up my account from my username?Forgot login credentials, can I look up my account from my username?
How do I find an available nickname in Pokémon Go?How do I find an available nickname in Pokémon Go?
Why can't I catch Pokemon in Pokemon Go anymore?Why can't I catch Pokemon in Pokemon Go anymore?
Why can't I connect to Pokemon Go via mobile data?Why can't I connect to Pokemon Go via mobile data?