It is essential to have the "title" and "alt" tags specified for each one of the images you use in your posts. The search engines will then know what this image is supposed to represent. Providing the title and alt tags for each image you use, however, can be a time-consuming task. Instead, you can use the handy SEO Optimized Images plugin.
Once you install the plugin, go to your WP-Admin Dashboard -> SEO Optimized Images. On this page, you can specify the ALT and TITLE tags for your images. The plugin gives you the option to use internal variables such as %title, %name and %category. With them, you can set the ALT and TITLE tags of your images to the title of your post for example. The plugin does the rest. This saves you a lot of time and keeps your images SEO friendly.
How to use Headings to optimize your WordPress blog
You should use the <h1> tag only for the titles of your posts.
You should use a few <h2> tags and as many <h3> tags as you need for the other headings in your posts. Doing this will allow the search engines to index the important information from your website better. A good document has headings and subheadings because headings make it easier to determine the subject of the page. For blog websites, the best SEO practice is to set the title of your post in a heading1 tag.