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 ...

How to Stream on Whowatch: Steps to Start on App and PC and Preparations

I want to try streaming on Whowatch. But where do I start, and what settings do I need to configure?”Even if you have created ...