What is a good post?
Make a comment or statement than can be discussed! No one really cares what you believe. It’s more interesting to discuss why you believe it.
Good in what way? To get points, opinions, feedback, clarity, understanding.... Please clarify your question...
A good post makes you think...or laugh...or feel great empathy. It can make you feel kinship or exasperation.
Or it can have boobies.
@Sticks48 and that generates thought, possible giggles, etc.