WordPress 5.9.3 addresses 19 bug fixes.
WordPress 5.9.3 addresses 9 bugs in WordPress core and 10 bugs within the block editor. You can read more by looking at the release notes: https://wordpress.org/support/wordpress-version/version-5-9-3/
You can also see a complete list of changes: https://core.trac.wordpress.org/query?status=closed&resolution=fixed&milestone=5.9.3&order=priority
If you have not done so already – download the update or simply use your existing installation of WordPress to update your site. Either way – this is an excellent time to make a backup copy of your site(s) before upgrading.