Tips on how to use the tool in the most efficient way

Many tutorials exist in different languages. It doesn't take much time and if you have no editing skills this is a good place to start. After you have created the Powerpoint, instead of saving it, export it as a video. You need to rehearse a bit because you'll see that the audio and slides are sync. You could also first record the audio and then capture the video presentation to move faster. Combine the two in an editor.