This is a living document and will be updated on a frequent basis. To the best of my knowledge, this constitutes best practice and all claims are sourced to help you evaluate them. In cases of conflicting or fluid information, you'll just have to look at the evidence and use your own judgement.
For those looking for just a summary, don't feel like you have to click through every link/reference.
Exposure risk calculator: https://covid19risk.biosci.gatech.edu/
A recent good discussion with experts on aerosols and exposure (2020-11-11): https://twitter.com/ASlavitt/status/1326366761437044737
See also: https://english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html
A good way to think about risk of exposure (2020-05-20):