This is a really good (in my opinion) video explaining 16 bit v 32 bit, dither etc. The speaker is the guy who invented Ogg Vorbis.
http://www.theverge.com/2015/11/6/9680140/chris-montgomery-digital-audio-hi-res-explainer
http://www.theverge.com/2015/11/6/9680140/chris-montgomery-digital-audio-hi-res-explainer