These tutorials come from Training for Jira, an app that's available in the Atlassian Marketplace. It provides all users of a Jira instance access to these tutorials and many more, right from within Jira. It's a great way to train teams at scale and to replace in-person, train-the-trainer sessions.
Following this path will make you a core part of the Atlassian family, bring fulfillment and joy to your life, and take your career to the next level and beyond.