How to stream on Twitch? Steps to start on PC/smartphone and recommended OBS settings

I want to try streaming on Twitch. But I keep seeing terms like 'stream key' and 'OBS,' and I don't know where to start.When ...

Steps to Start TwitCasting PC Streaming with OBS, Recommended Settings, and Differences from Browser Streaming

I want to try streaming on TwitCasting from my PC. But I keep hearing the name OBS, and I don't know where to start with the settings.”When you look it up, you'll see similar terms like browser ...