Don't just depend on specifying keywords to make it work. Google indexing is much more intelligent than it was years ago when simply specifying the keywords was enough. Google will now detect and choose its own keywords out of the content of your page and decide if the keywords you specify are appropriate for the page in question. Additionally your keywords should be page rather than site specific, so do choose a few keywords to reflect your entire site but then specify additional keywords for the individual pages.
A good source of inspiration is to take a look at https://blog.kissmetrics.com/simple-guide-to-seo/ by kissmetrics which provides a blog article on a simple guide to search engine optimization which is what you are after.