CODE TAGS are described:
1) in the Rules you were asked to read when you registered
2) in the text at the top of the C/C++ forums
3) in the announcement at the top of the C/C++ forums titled Please use BB Code and Inlinecode tags
4) in the sticky post in the C/C++ forums titled Read Me: Read This Before Posting
5) any place CODE tags were used, even in responses to your posts
6) on the background of the box you actually typed your message in on the C/C++ forums

How can you not know what they are?


If you're clear, that's good. If you're unclear you should ask in the proper forum. Not in the Feedback forum.

Learning daniweb's posting guidelines is useful to your major? What about reading comprehension?

"Community Introductions" would be the proper forum for posts like this. Welcome!

if one is unable to find out which category he should post , shall he post in geek lounge ?

There's a forum fit for pretty much everything, but if a user truly cannot find somewhere then they should PM me and I'll point them in the right direction.