The Raspberry Pi has an on-board audio jack, which is super handy for all kinds of sound effects and speech, just plug and go! However, for when you want better audio for music playback, a USB audio card can greatly improve the sound quality and volume, this tutorial will show you how...
This tutorial is only for getting the audio output jack working. We don't have a tutorial for the microphone input (yet!)
We have tons of tutorials on that front, so get your SD card loaded with Raspbian (that's what we're using in this tutorial), and either ssh in, log in with a monitor and keyboard, or a USB console cable
Just a reminder, this tutorial is only known good for the USB audio card in the Adafruit shop. Audio cards all use different chipsets so if you have another card, it may not work here! You'll have to figure out what's different for your model.