Drupal 8

The composer require command can help you get your requirements into composer.json more easily. However, that ease is more theoretical than actual for modules without a full stable release.

The Honeypot module has a full stable release version, so any of these will work:

composer require drupal/honeypot:8.*
composer require drupal/honeypot:8.x
composer require drupal/honeypot:8
composer require drupal/honeypot

Does it appear that Drush update is not fetching the newest minor version update of Drupal 8? Changelog says 8.0.0 at the top, but you know 8.0.2 has been released, and drush up or drush upc says update information last refreshed that day yet says "No code updates available."?

The error is pretty straightforward but the sheer confusion of where to place class files in your module (first off, yes, they do go in your module) might make this a pretty commonly googled error.

Drupal may give an error like this:

Error
The website has encountered an error. Please try again later.

Look in your logs for more detail:

tail -f -n100 /var/log/apache2/error.log

Here's the key problem:

These notes accompany a presentation given at BioRaft Drupal Nights and at NYCcamp.

The image-heavy (but often context-light) presentation slides are on Prezi.