I agree with try-before-you-buy for bicycles - size, style, etc make a massive difference in utility and comfort. But, how would somebody who only had a bike a

I agree with try-before-you-buy for bicycles - size, style, etc make a massive difference in utility and comfort. But, how would somebody who only had a bike as a child know this? Google isn't telling them - it sends them to Amazon via listicles. If they happen to search "how to buy a bicycle" there are some potentially useful results. But, even if they do end up a bicycle shop, their likely to run into inventory problems - many bike shops simply don't have any bikes right now. So, it's back to Amazon, or Craigslist/FB Marketplace, or worse.