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To run my campaigns on SEOmoz or google or other search engines, i need to have some clarity on what exactly a keyword means. firstly, how do the comibnation of different words work? Example : Buy apple laptop in india, 2) Buy apple laptop india 3) apple laptop india Are 1, 2, 3 considered as keywords OR Apple, laptop, India, Buy, considered as keywords? to run campaigns in SEOmoz how do i use the tool more effectively, should i chose how my users would search in the search engine or use certain keywords. in the above example the only difference between 1 & 2 is the word "in", and i see a significant difference in the search results. How do use/target my keywords?

Am on a beginner level of SEO and as a pro member when i ran a report for my site i found some basic terms used. Can anyone please let me know what exactly is the difference between these terms and how important are they and how do i improve them?. or please let me know a source to find out.