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I often hit snags that seem to defy logic and Google. I'll put them here for now and maybe someone can weigh in on the solutions.

settings.local.php causes WSOD ​

Updated: 8-30-23

In this case, I loaded a site onto my new m2 mac from git, fired up ddev, imported a current production database, confirmed the site was running and logged into it. Then I added the stock sites/default/settings.local/php as well as sites/development.services.yml. Anything I do caused this kind of error. No amount of cache clearing, config importing etc. will make it work/

The website encountered an unexpected error. Please try again later.
RuntimeException: Failed to start the session because headers have already been sent by "/var/www/html/docroot/sites/default/settings.local.php" at line 1. in Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (line 152 of /var/www/html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php).
Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (Line: 162)
Drupal\Core\Session\SessionManager->startNow() (Line: 110)
Drupal\Core\Session\SessionManager->start() (Line: 57)
Symfony\Component\HttpFoundation\Session\Session->start() (Line: 54)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)