See Release Notes

• Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
• Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
• PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.

• Moodle 3.11 Database Schema (by Marcus Green)