13. Claim Daily Free Items In The Shop
After you've got past the awesome-sounding idea of having the availability of Pokéballs be mapped to real-world shop locations, it'll suddenly dawn on you that you might actually have to go to the shops, just to stay stocked up.
Thankfully, that's not entirely the case, as hopping into the Shop menu from the Pokéball icon does open up a world of micro-transactions (the app is free, so Niantic/Nintendo have to make their money back somehow), however look to the top right, and to the 'shield' icon.
This can be tapped once a day for a daily bonus, and if you've missed it for a few days already, the number in the middle denotes how many 'freebies' you're yet to claim.