This dictionary describes a solid amount of terminology regarding 4-key rhythm game play and patterns, complete with numerous animated examples. It's not comprehensive, but certainly suffices as an introductory resource for those seeking a better understanding of what's sometimes discussed regarding step charts or playstyles.

A spreadsheet containing detailed information on Etterna's timing judgment windows, as well as scoring parameters based on accuracy to the millisecond.

If you ever want to look for a dedicated keyboard for rhythm games, this sheet contains analyses of keyboards used by players in the Etterna community and evaluates whether or not their setups make them suitable choices for use in high-level Etterna content.

A wide variety of charting guides and tools can be found here. Learn how to get started with charting editors, where to look for feedback, and learn about various charting concepts and approaches. Once you've learned charting basics, I'd highly recommend Cosmovibe's charting guide for understanding some of the more in-depth topics.

Use this tool to tap along to the rhythm of a song to help estimate its BPM. This can provide a helpful second opinion when trying to evaluate a song's BPM, alongside things like Arrowvortex's BPM detection.