[mcloren]

For beginner, you can do a simple market research to determine the demand and the competitiveness of your niche.

Demand analysis

Use google keyword tool and check the number of monthly searches using the exact keyword for your niche. Use long tail keyword like "dog food for toy poodle" instead "dog food" or "dog food for poodle". Be as specific as possible.

Competitive Analysis

Google search the exact keyword you use in demand analysis using "allintitle: your keyword". this way you can check how many people are already in that niche.

Divide the number of monthly searches you got from demand analysis by the number of results from competitive analysis. A ratio of 2 or more

[johnniewalk]

Even if you created Your website already started doing Off Page SEO then u can check google webmaster tool in that also u can research your keywords through impression showing and searches happend...

[jackluter]

Based on your domain and keywords manage to generate traffic source by blogs with unique content sharing in social networking.

[bcetindra]

Demand analysis

Use google keyword tool and check the number of monthly searches using the exact keyword for your niche. Use long tail keyword like "dog food for toy poodle" instead "dog food" or "dog food for poodle". Be as specific as possible.

Yes that is good information.But short tail keyword also we have to follow because now a days through short tail keyword traffic is coming....

[williamjohn]

Using Keyword planner tool you can do research on keywords and using SEO audit report you can do the competitor analysis.