New to the site, what is allow and not allow to post about ?????????

First of all, read the site Guidelines, which you can find under "Help" next to your username at top left. They are very simple and mostly obvious. After that, remember that the minimum age for joining this site is 13 but bear in mind that it MAY be seen by people much younger than that. Also, you should remember that whatever you post on here is visible to anyone with a browser and a search engine. It is up to you, of course, what personal details you choose to make public. You may find my guide to MyLot useful as well: