1. Lookswise, it depends on the location and time period. In the 1st world the standard requirements are 6ft height, angular face without deformities, NW0 hairline, being neurotypical and a decent frame. It really may vary.
It's easier to say whether someone is Chad or not, judging from the girls that have drooled over him. If there aren't any, he clearly isn't a Chad. If they've been showing attraction from his puberty until now, this is a real Chad. Judging from present only isn't that reliable, because a sub-Chad can become attractice through statusmaxing.
In short, Chad is a man who has never been supposed to do anything to attract women.
2. There are 3 widely recognized pills, representing 3 possible attitudes towards romantic life.
The blue pill is promotion of the idea that looks matter little, compatibility of characters and personalities is the dealbreaker and there's the true love out there for everyone.
The red pill is realization that good looks matter and suggestion that one can compensate their absence by being a manly man, learning pick up art etc.
The blackpill is acceptance of the fact that it's over and you can't do anything if you don't have the looks.
These pills are more than just that, colour-pilled views can shape one's entire outlook on the world, but these are the basic ideas to get to know before moving on.