how can we make every newbie know about the rules of the community
Everytime there's a new member in the family, it's the job of the existing members to make them feel comfortable. So first of all, I would say, that since we all are here for a comparatively longer time and understand the platform better, we should welcome the newbies nicely and let then settle in and gel well with the system.
Next, I believe, it should not be like we are imposing any rules on anyone. Anytime they are being told something that's generic to the community and has to be followed, it must be communicated in a manner that they should feel the ownership and not take it as a burden to be followed and taken up.
And lastly, there is this account https://www.proofofbrain.io/@newbies-guide which helps newbies settle into the system. We can guide them to the account and help them understand how it works.