Google SERP displays my website's internal page when I search for my main keyword. When I search for other keywords it displays the homepage but not for my targeted keyword. How to solve this problem?
What is the URL of the site you are having SEO Issues with..? I would be happy to take a few moments and look into the issue for you, then provide advice / recommendations based on the outcome of the SEO Evaluation of your website.
So it sounds like your page is indexed at least. Now you need to learn SEO and make the necessary SEO changes to your website so that it can get ranked. There is more to it than just putting the website online, you have to optimize it and build it's authority so that it will rank for your desired keyphrases