Native recording tools in Windows 10
If you need to make a recording of your screen or using your webcam, you're in luck, because Windows 10 offers native recording functionality.
https://www.polygon.com/2015/7/31/9081715/windows-10-game-bar-how-to-record-screen-video
A full guide to how to use the recording function of the windows 10 game bar can be found there, but simply put, you can use the Windows-key + G to open a menu that will allow you to record your screen inside apps.
The recordings you make there can be found under 'captures' in your 'videos' library.
Recording yourself is just a matter of opening the Camera app, either by finding it in the start menu or typing 'camera' into the search bar.
The recordings you take with the camera app are saved under camera roll in pictures.