Genuine effort, original content, good dispersing around the web and link building. Now just add time, As stated by everyone above. I know you want overnight success but if that's to be the case it would have to be through ppc, banner ads or having a social network with alot of current fans and followers...
Firstly, blog about something you are passionate about, this way you will creaet quality content, something which is always the key to suceess. Secondly, build links by participating in related blogs, forums and write articles. Lastly, be patient and persistant, this always pays off
yes . aside from having a great and helpful contents. maybe try youtube videos and be creative like have an advance information or predict something that would surprise the world
I would say, you just have to be careful when commenting since some moderators may consider a comment a spam when it does not offer substantial and useful content.
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The best way how to improve your blogs traffic is to write an original content. Thats how I get a good traffic because the visitors will start to trust you.