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On this page you can find some of the errors I encountered, and how I solved them.
SyntaxError: expected expression, got '<'
The entity type did not specify a x form class [SOLVED]
Error: Call to a member function getPurchasableEntityTypeId() on null in Drupal\commerce_order\Entity\OrderItem::bundleFieldDefinitions()
Numeric value out of range: 1264 Out of range value for column X
Drupal 8: The following module is missing from the file system...
Drupal 8 drush: Attempting to re-run cron while it is already running [FIXED].
User warning: The following theme is missing from the file system: X in drupal_get_filename()
Only variables should be passed by reference views_embed_view drupal 8
InvalidArgumentException: Placeholders must have a trailing  if they are to be expanded with an array of values.
Drupal 8 api call returns 301 error moved permanently
Invalid path or filename /usr/bin/java for java executable
Drupal\Component\Plugin\Exception\PluginException: Plugin (footer_block) instance class "Drupal\my_module\Plugin\Block\footer_block" does not exist.
Class [myClass] is not autoloadable, can not call post-update-cmd script
failed to open stream: HTTP wrapper does not support writeable connections