I am thinking of a website with information about diseases and discussions within this information.
Should you use the post module or the forum module?
etc. I want to serve with these categories. Which module is more appropriate and recommended for Publishing, Discussing. I have a forum and a text post module. There is another option. I want it to be long lasting and useful.
My categories may increase in some areas. tags may multiply.
Sounds like you want the Discussion, Conversation, Posts, Photos and one of the Articles Mods (AQB soft or Jerome Mingo). There is also a Glossary module by UNA which automatically alphebetize your articles.
I think those should work and will nicely service your Timeline or Outline blocks with new contents.