Drupal 10 will be supported until the release of Drupal 12 in mid-late 2026
Beginning with Drupal 10, a new Drupal major version will be released every two years in even years (2022, 2024, etc.). 

The fifth and final feature release of Drupal 9 brings a stable CKEditor 5 module, a command line theme generator, and helps prepare for your update to Drupal 10. 
Bugfixes will be provided for Drupal 9.5 until June 2023 and security fixes will be provided until November 2023.

I always wonder, does Drupal integrate only with CKEditor for its long text editing needs...

so, I just found a few text editors that should be tested and checked

I will try to give some overview on them, please feel free to comment and give to community of your own experience

In Drupal 10.1, completely rewritten aggregation generation logic solves both of these issues.

Aggregates are now built by a dedicated route, with the main request only responsible for generating the aggregate URL based on libraries, theme, language, and grouping logic.

Drupal 10 will be a refined version of Drupal 9 including all the goodies from all initiatives. It will include Olivero, Claro, all the work from the Automated Updates Initiative, Bug Smash, Easy Out-of-the-box, Decoupled Menus, and the Project Browser if we have one in time.

You are always looking for the best CMS to build exceptional digital experiences, choosing Drupal will be a significant decision and a very strong one., because when it comes to web development, the right selection of CMS can make a huge difference and transform the whole digital experience.