There is a vast amount of literature on image optimization for SEO purposes . The fundamental questions for our SEO checklist , those that are always valid, beyond for example the size of the image itself, are:
Are the images named correctly?
Keyword-primary.jpg is correct, keyword-secondary1.jpg or keyword-secondary2.jpg as well.
1123.jpg or keyword600x400.jpg no.
Is the ALT tag being used to its full potential?
From experience, I know that a “descriptive” use of the so-called alternative text is rewarded. So, it is better not to limit yourself to a few words, which perhaps repeat the name of the file, but to try to provide a description of one or two benefits of using our homeowner database sentences, logically in line with the content. Let's also keep in mind that Google “recognizes” the text that appears in an image , so another tip is to always insert one or two images that contain a title or a series of sentences (better if short) in line with the topic of the content or, better, of the post itself.
To learn more, you can read the post: Images and SEO: how to optimize images for Google .
H2 and H3 titles
Those who consider Yoast as the source of all truth are probably wrong. However, his advice to insert the main keyword – and, I would add, the secondary ones – in the H2 and H3 titles of an article or post is correct. As long as you don’t overdo it – at the risk of writing over-optimized content – and you don’t bore the human reader, who could quickly get tired of seeing the same word repeated to the max . Speaking of natural keyword density, I recommend reading this post .
Internal link structure
If used well, internal links can have a great SEO impact . Not only that: they are the tool that most helps the reader navigate through our website. For this reason, before publishing an article or post, we cannot forget to ask ourselves if we are providing the reader with all the necessary insights, referring them to any previously published ones. If a post titled: “How to choose the title of a blog post” inevitably ends up talking about topics such as:
What is SEO writing?
What job does a SEO copywriter do?
How to optimize images for SEO purposes
etc.
Logically, each of these arguments will have to be supported by an internal link that will send to the corresponding resource.
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For those who use WordPress, there is a recommended plugin to optimize this process: it is called Interlinks manager and it allows you to automatically insert a link to other pages or posts on your site. My advice is not to entrust this process exclusively to Interlinks manager, but to get help from him for the main keywords, those that we always want to link to certain resources that are fundamental for us.