I want to make a quality post what should it has abilities?
1. Should I choose a one topic like current affairs or only bitcoin or only altcoins discussion or should I post everything here.
This forum is quite broad. You can definitely make a post on different topics and join any discussion. Enjoy exploring! And then ask yourself first before making a post, "does this post bring something new and relevant idea or information to the discussion?"
2. Should the post has old information?
It all depends on the specific discussion. Perhaps as yourself, "does this old information help or contribute something to the discussion?"
3. Should I post only links which define my whole post.?
Never! Please avoid this. Don't just post links. Post only the gist or the relevant or salient points of whatever that link provides. That's in addition to the link, of course. Please retain the link as a source. That's proper citation or acknowledgment.
4. Should I reply to every one who reply to my post? ( 4th number add now because I think this is compulsory question)
Of course, not. Not every post needs a reply.