A great article by the author of the PubGrub algorithm, discovered when reading more about the gel gem, an alternative to bundler

Some conventions on naming your gem.

Very well written article explaining everything that comes into a gem specification file. Doesn't take you for a fool, explain things one by one so you can get a better understanding of what you are doing.

Also, use a generator once you understand it!

How to fix LibSSL when install mysql2 gem driver

Also, whenever upgrading MySQL, always always always run:

mysql_upgrade

See https://www.hivelocity.net/kb/using-mysql_upgrade-command/

Simpler authentication than Devise