Keyword Location :- So now question arises that Where

Keyword Location :- So now question arises that Where should you place Keyword in URL for better rankings ? I would say your keyword must be closer to your domain . Means keyword should be present in starting of URL . So keep URL targeted and keyword close to domain .
Sub-domains And Pages :- Well , search engine gives preference to pages more then sub-domains . If you are using category based URL structure for your pages then its the best and you don’t need to use Sub-domains for ranking . For example , From following URLs search engine will give preference to 2nd URL . :-
Sub-domain :- gadgets.technoupdates.org/Samsung-galaxy-camera-review
Page without Sub-Domain :- technoupdates.org/gadgets/samsung-galaxy-camera-review