Search for pods (above). Then list the dependencies in a text file named Podfile in your Xcode project directory:

platform :ios, '8.0'
use_frameworks!

target 'MyApp' do
  pod 'AFNetworking', '~> 2.6'
  pod 'ORStackView', '~> 3.0'
  pod 'SwiftyJSON', '~> 2.3'
end

Tip: CocoaPods provides a pod init command to create a Podfile with smart defaults. You should use it.

Now you can install the dependencies in your project:

$ pod install

Make sure to always open the Xcode workspace instead of the project file when building your project:

$ open App.xcworkspace

Now you can import your dependencies e.g.:

#import <Reachability/Reachability.h>

Sometimes CocoaPods doesn’t yet have a pod for one of your dependencies. Fortunately, creating a pod is pretty easy:

$ pod spec create Peanut
$ edit Peanut.podspec
$ pod spec lint Peanut.podspec

You can find a lot of information on the process in the guides. When you're done you can get an account and push your pod to the CocoaPods Trunk.