Monty Montgomery for xiph.org explains the ins and outs of how digital audio works. The physics of audio seems mystical and there is a lot of confusion around it. But this simple video explains away all myths and misconceptions you might have.
It’ll totally neutralise your desire to use sample rates higher than 44.1khz and probably help you decide about finer details of mastering like bit-depth, dithering options and dither weighting. Knowledge is power and this is one powerful video.
I highly recommend watching this one and let it open your mind. Thanks to Image-Line makers of FL Studio for keeping this video online.