Hi, Im a newbie to blog hosting.
can anyone here tell me how can i copyright my articles or if i can copyright my blog so whatever i post there can be secured from copycats.
thanks
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Welcome to Sitepoint!
Depending on the laws of your country, copyright law may or may not be relevent as soon as you publish something. Of course adding a copyright statement somewhere on your site is always a good idea, but that won’t stop people from actually copying anything.
There’s an old adage “if you don’t want people to copy it, don’t publish it” - you can’t stop people from copying anything, but if you find your content has been plaguarised you can take steps to have the copiede content removed, usually by contacting the site owner directly asking for removal.
If it doesn’t have a copyright notice, it’s not copyrighted."
This was true in the past, but today almost all major nations follow the Berne copyright convention. For example, in the USA, almost everything created privately and originally after April 1, 1989 is copyrighted and protected whether it has a notice or not. The default you should assume for other people’s works is that they are copyrighted and may not be copied unless you know otherwise. There are some old works that lost protection without notice, but frankly you should not risk it unless you know for sure.
Hope this helps
The content you write as denoted above will be automatically copywritten to you at the point and time you complete the unique work. While having a copyright in place does prove you are the original author unfortunately it doesn’t prevent other people stealing your work (if this was true the media industries wouldn’t have such a problem with file-sharing). What you essentially need to-do is keep a look out for when people steal your work, and then file a DMCA (Digital Millennium Copyright Act) takedown notice (there’s templates for those online) with a demand to remove the content. Basically it’s a never ending battle where you just have to keep sending takedown notices to them, their host and to Google (in sequential order if they refuse) until you stem the issue. 
Not necessarily. I often see the exact same content on multiple sites each of which have copyright notices. Proof of who is the original author is not always easy to determine. I’m not saying determination of original copyright can not be done, only that a copyright notice is something anyone can, and most do, use whether it is their original content or not.
While it’s a point (and a valid concern at that) I was more leaning that towards registered copyrights (with the appropriate organization) or through a poor mans copyright - thus having some kind of time-stamp or recognition independently which can verify a period at which the idea existed.