10 interesting points to review on this Bicycling article: bike fitter experience, historical bike fitting dogma, indoor/outdoor differences, bike fit process needs to be explained to cyclist, start with the right frame size, bike parts changing can affect cyclist fit, fitting on one bike can be different on another, often bike fit helps to fix niggling pains, bike fit is not for life, bike fitting and rider technique.  
​http://www.bicycling.com/beginners/bike-fit/10-bike-fit-myths-busted?utm_source=t.co&utm_medium=Social&utm_term=833831060&utm_campaign=Bicycling

Read first this article on what you'll find on the market.
​https://cyclingindustry.news/jon-iriberri-the-current-state-of-the-cycling-shoe-market/