Good manners and etiquette used to be synonymous. Being well-mannered means being socially pleasant. Etiquette is a set of codified rules for behavior. Manners are Venus matters, 2nd house values and 7th house balance. I would say they are primarily Libran but Taurus is also involved. Etiquette is more Saturn-ruled, the 10th house, public, traditional, restrictive and sometimes archaic. Modern, updated etiquette adds Jupiter, expanding the rules.
The attitudes of an individual can be observed in Venus and Saturn related placements, by aspect and by house. They can also be observed in Mars, Mercury and Moon placements as well, which relate to how you act, communicate and feel. Venus-ruled placements, in the 7th house, aspecting Venus or in Libra or Taurus, tend to the pleasing side, good manners. Saturn-ruled placements, in the 10th house, aspecting Saturn or in Capricorn lend an air of the traditional. Adding Jupiter or Uranus into the mix can increase the effect, modernize it or make it shocking. With so many variables in one individual, it’s rarely straightforward. We are complicated beings.
One interesting item of note is that Libra and Capricorn are both cardinal, action-oriented and controlling. At their heart such matters are invariably about control, control of self, control of others, control of the social environment. Examining something so seemingly frivolous as your own attitude about manners and etiquette unearths its deep roots that spread to all areas of your life. Pluto in Capricorn digs up tradition to look at the roots. Saturn in Libra opposing Jupiter in Aries can be balancing traditional social rules with modern action.
What are your own attitudes about manners and etiquette? Can you see the astrology?