How to tag a Post?

Tags are important for a posts rating in Google. But how do you tag them, and will they reach the goal to cover a wide range of search options? There are many programs out there for Search analysis, but one of the easiest ones is Googles own Keyword analyser.

Just write a keyword, and Google will give you suggestions about words close to yours with figures on how many, who have searched on each keyword.

Another simple trick, is to find out a common misspelling close to yours keyword.