These are available some in English and German. The first link is more for server side and has the security info you desire, I’m sure. Since SELinux isn’t here until 11.1, you’ll have to wait for that. Even then there is no policy with the package. But, the wiki articles will answer you questions, surely.
Some others will likely also have a reply for you, perhaps more specific.
(I see there is no spell check using Debian/Epihany - must be flash. Nuisance.)