Apple has released Safari 13 for macOS. It contains feature improvements as well as privacy, security and compatibility enhancements and is recommended for all users. According to Apple, the update:
Includes an updated start page with Favorites, frequently visited, and most recently visited websites;
Provides a warning if a weak password is typed when signing in to a website and helps to upgrade it to a strong password;
Adds the ability to enable Picture in Picture from the audio button in a tab;
Enables jumping directly to an already-open tab from the search completion list when the website address is typed into the Smart Search field;
Adds support for authentication using USB security keys on supported websites.
You can obtain the update via the Mac App Store in the Updates section.