Pokestops

PokeStops are places in Pokemon Go that allow you to collect items such as eggs and more Poke Balls to capture more Pokemon!

These will be located at select places near you, such as historical markers, monuments, and art installations. PokeStops are indicated

on your map with blue icons, like the ones above. When you're close enough to interact with the icon, it will change shape. Clicking on the icon will then allows you to swipe the Photo Disc, which will generate items in bubbles. Tap the bubbles to collect your items! (You can also just exit the PokeStop once the items appear. They will be collected regardless).

After you've collected items from a PokeStop, the icon's color will change to purple, and you will not be able to collect items from it again until it refreshes to blue, which takes about five minutes. Conveniently, you don't need to travel away from the PokeStop for it to refresh, so if you live or work on a PokeStop you can get items often!

Most often, a PokeStop will grant you three to four items at a time. Until you're level 5, PokeStops will grant you exclusively PokeBalls andPokemon Eggs. One you reach level 5, at times PokeStops will generate up to six PokeBalls, and other items such as Revives and Potions to use now that your trainer can access Gyms and battle other Pokemon.

Lure Modules and PokeStops
If a player purchases one of the Lure Modules from the in-game Shop, the player can place a lure at any PokeStop to increase the amount of Pokemon who will gravitate to that area - and this will benefit any other players in the area. You can even see when a PokeStop is under the influence of a Lure Module on the map

by looking for the showering of pink petals, and interacting with the PokeStop will have an icon that details who used the lure

BRING LURES (AND FRIENDS WITH LURES)
To make this work, you'll need a lot of Lure Modules. Since you only get a few lures from leveling up - you will either have to buy a lot of them yourself, or get a group of friends (or even find a nearby community) to help pitch in. Having all of the PokeStops enabled with lures is key to farming, as it allows you to continuously walk to each PokeStop in turn that are nearby with a almost constant stream of appearing pokemon.

If you happen to stumble upon a popular area with players and stops that have lures, be sure to contribute where you can!