To improve indexing by and ranking in search engines there are some basic rules;
You can add “Titles and Descriptions” in the code of the website pages per page (in WordPress this can be done with a plugin). These so-called Meta-tags are not readable for your visitors but are readable for the search engines that will index the titles and descriptions.
For the Titles and Descriptions the following is important:
They correspond to the content of the text on the page in question.
Include the most important phrases / words.
The titles and descriptions are not too long, follow the specified maximum length of the Title and Description.