Sometimes it becomes difficult to rank on the low traffic keywords

These days, it's almost the correct opposite. Even keyword phrases that no one searching for can sometimes be tricky to get high rankings with unless you actually and really know what you're doing. The best way to get your website ranked in the Search engines is: Ethical Meta Optimization, proper link exchange and SEs Submission.

If the website is new, then it becomes very important to optimize the website in a very effective manner. Over optimization can effect the ranking of the website, even the website can be banned by the Google.