Originally Posted by
ShallowJam
What are some indicators of quality bikes? If I go to a bike shop and get presented with a few bikes of the same price range, what are some key features or manufacturing standards I should be looking for?
This one is easy. If the bikes are the same type, the bikes carried by a bike shop at a similar price will have a similar quality. A few brands, for example, Kona a Jamis, might be a bit less for the same quality.
What you can't do is compare different types of bikes that are similar in price.
Originally Posted by
ShallowJam
Will I be able to sell my bike for any substantial amount of money? Or is a used bike hard to sell, and especially hard to sell for a decent price?
It's not clear what by "decent price". You won't get anything near $500. "Meile UA" isn't going to be familiar to too many people here (from the US). Are you from Canada (or Ukraine?)?
If you are not in the US, keep in mind that the advice you get here will be US focused (especially, if people have no idea where you live).