People who don't want to pay for their screen recorder tools tend to flock to OBS Studio (Windows, macOS), and with good reason: it lets you effortlessly blend different sources and audio tracks together, packing in features you'd usually have to spend heavily to get.
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Built with gamers in mind, live streaming options feature prominently, but you can just as easily save your recordings to disk. On top of that you get advanced features like noise reduction (for your voiceovers) and the ability to set transitions between your scenes.
All of this is overkill if you just want to record a quick clip – and to the complete beginner, OBS Studio perhaps isn't the best of the options listed here – but you get a pile of fine screen recording and live streaming features for free, and that's difficult to argue with.