You'll eventually decide what works for you.After some years of study,
these are the orbs I use:
With Dynamic aspects
(conjunction, square or opposition):
Sun or Moon in aspect to anything - 5-6 degrees
Lesser planets and points in aspect - 3-4 degrees
Softer aspects (sextiles, etc.):
Sun or Moon in aspect to anything - 2-3 degrees
Lesser planets and points in aspect - 1-2 degrees
For me,
wider orbs than these are not significant,
unless other factors contribute.
A 2 degree Moon conjunction to the DC
is significant and may be interpreted in the 7th,
but with some amount of inequality, service, etc. (6th)
hope that helps!