In some parts, audio from the mic will have to be louder than background sounds, while in others mic audio is completely unnecessary. OBS automatically captures your desktop audio, and you have the option to connect a microphone and record this sound as well. Then, source of audio as well as video capture device (this is for streamers that are using webcams or regular cameras for live-streaming, and a capture card for OBS). If neither works, record only one of the active windows with Window capture.
It has the most sources – firstly, you have to add either game capture or display capture. The primary scene is your main content, or in other words, the game you decided to stream. You can stream without them, but implementing this system will give you more versatility, and your content will look more professional. Now, let’s focus on the necessary scenes for every live-stream. Twitch panels and overlays will significantly improve the quality of your content – they can be used as transitions between different scenes, and how to use an overlay in OBS for transitions will be explained later.