Make WordPress Core
https://make.wordpress.org/core/ The WordPress core development team builds WordPress! Follow this site for general updates, status reports, and the occasional code debate. There’s lots of ways to contribute:
WordPress 5.9 Development Cycle :: https://make.wordpress.org/core/5-9/
How to contribute
To get involved in WordPress core development, head over to Trac, and pick a 5.9 ticket. Need help? Check out the Core Contributor Handbook.
Get your patches done and submitted as soon as possible, then help find people to test the patches and leave feedback on the ticket. Patches for enhancements will not be committed after the dates posted above so that we can all focus on squashing bugs and deliver the most bug-free WordPress ever
If you want to dive deeper into 5.9, join the weekly meetings in the #core Slack channel, which occur next at Mittwoch, 18. August 2021, 22:00 MESZ.
see more; demo of current and new features coming to the WordPress block editor
https://www.youtube.com/watch?v=a1Sf7PxfmLQ
A narrated demo of current and new features coming to the WordPress block editor (codename: Gutenberg). Created by Matías Ventura and Beatriz Fialho; narrated by Beatriz Fialho.
get more infos and insights: https://make.wordpress.org/core