OBS is a great choice for recording speedruns. u can set a hotkey to record and stop recording, even pause recording.

i recommend this app to the people who use a recording software that doesnt have scenes, sources, plugins, scripts, and audio sliders.

theres gonna be a link here for the OBS small tutorial for beginners but i havent recorded the video yet so just wait

I like using OBS Studio. And, you can also set up an Controller as well. And, that is another good thing as well. You can even also set up a Keyboard and Mouse as well. It is important to learn how to do all of this. So, that is the reason why you would need to get OBS Studio. I use it when I play my video games. And, I am about the results.