All SEO experts believe in the importance of optimizing keywords for search engines. Search engines need to know enough about your keywords so that they can help your pages visibility. If you're optimizing keywords for every page of your site, search engines help those pages be found as well.
How's Optimizing Keywords Done?
Before any other things, you need to select your keywords carefully and smartly. Keywords aren't the words or phrases that you invent. You have to discover what searchers are typing to find what they want. Then, you choose the closest to the content you want to write and write with those keywords in your mind.