There are two parts of SEO plugins to control the default structure of your page titles and descriptions. Navigate to SEO then go to Search Appearance and you will see a bunch of tabs for the different types of pages on your website. For each type and taxonomy, you can set a so-called Title Template as well as meta description templates. This allows you to use components and variables to control how your page titles should behave by default. This can be overridden on a page-by-page basis. There all sorts of variables you can use the titles of the page, to stop you from manually having to write titles from scratch for every page.
Correct use of headings
Headings are good when structuring your content and help readers process information in bite-sized chunks. They can also help describe a page’s layout and focus on search engines. WordPress transforms the headings you put in your content in to their respective HTML tags (<h1>, <h2>, <h> and so on. This makes it necessary to think about the type of headings you will use, and in which order. Getting this wrong makes your content hard to understand. Most themes for WordPress get the basics right, this makes it worth ensuring templates sets your post title is as <h1> tags anywhere else on your page or post content.
Your post content should then ‘flow ‘naturally ; for example, large, significant headings should use <h2> tags, subsections should use <h> tags, and then subsequent new sections should use <h2>.