Odds are, you're aiming to get traffic via search engines. You can write the most informative article out there, but if search engines (read Google) can't find your content or understand it (via meta and HTML tags) then you'll get exactly zero organic traffic.
The topic of SEO is very complex, and all there is to know in the field could cover multiple courses. There are many things you should do for your entire blog to increase your search engine ranking. But there are also some things you should make sure are done for every post.
Make sure your posts include a meta title and meta description. These do two things: help search engines understand what your content is about and get users to click through to your article. You'll, therefore, want to make sure that they both do a good job of targeting the keyword(s) you want to (though you certainly don't need to include the specific keyword word for word) and that they are compelling enough to make readers want to click on it to read your article.
HTML tags on the page are also important, particularly the header tags (h1, h2, etc.). You'll want to have one h1, that being the headline of your article on your page (this could match the meta title or could be different). You'll also need h2's (and maybe h3's) for the different sections of your article.
This is obviously just the tip of the SEO iceberg. If you sign up for the
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