The core version of WordPress (i.e. with no plugins installed) has export functionality built-in. You will find the export feature in the main WordPress admin menu in the Tools section.
There are three options available. The first option backs up all content including posts, pages, comments, custom fields, categories and tags.
Alternatively, you can choose to only export posts or pages. You can filter what is exported and only export content from particular categories, authors, date range and publication status.