Switching to Drupal 10
Drupal 10 is out for more than two months already! And this is extremely exciting.
Usually it takes from a year to switch to new core version: a lot of modules to upgrade, significant code changes. But Drupal 10 has almost the same core code as previous generation Drupal 9.5. There is a lot of deprecated code removed, there are some new features, but most of 9.5-compatible code runs without any problems with 10.0-core.