There are no official content standards here, but at least they include the following:

- Links to site, whitepaper, and all related social media.
- Problems faced by the public.
- Your solution (in brief).
- Product features.
- Achievement targets.
- Information about the team, office and etc.
- Other additional information if needed.

That is the basic information that most people want to read in one thread.
Additional advice:
Don't post anything if everything isn't ready (except scheduled development/roadmap).
Most scammers reason about readiness (especially the recruitment of teams/advisors) when they start being caught.