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This series is for Data Center, if you are on the Cloud, this is for you: How to start . If you do now know on which hosting you are, find more information here: https://community.atlassian.com/t5/Confluence-articles/How-do-you-know-if-you-are-on-Confluence-Cloud-or-Server-Data/ba-p/1917899#:~:text=%F0%9F%92%BB%20Look%20at%20the%20URL,are%20on%20Server%2FData%20Center.
Each tutorial is in order to make you learn Requirement Yogi from the basics to lesser known features that could improve your work.
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