Create a Twitch account and enable two-factor authentication
Download and install OBS Studio
Open OBS Studio
Go to Twitch Creator Dashboard
Copy your Twitch stream key
In OBS, open Settings
Select Stream
Set Service to Twitch
Paste your stream key
Click OK or Apply
Add your video source in the Sources box
Add your audio input and output devices
Adjust your scene layout
Open Settings
Select Output
Set your bitrate, encoder, and recording options
Open Settings
Select Video
Set your base and output resolution
Set your FPS
Click Start Streaming in OBS
Check your Twitch stream for video and audio
Monitor the stream in OBS and Twitch Dashboard
End the stream by clicking Stop Streaming in OBS