As of April 27, 2022, v2.1.0-4 beta for Synth Riders Beatmap Editor is released. With the update comes new changes to the hotkey list and fixes in known bug issues. A list of all the changes can be found here: https://synthridersvr.com/editor-guide.
This guide will take you through your mapping journey. Beginner will help you get started making your first map. Intermediate will give you pointers on how to improve as a mapper. Advanced has all sorts of information that will open your mind to the possibilties of mapping! References contain useful information that you may need to look up and keep on hand.
You don't have to do this alone! Our mod community Discord server is always happy to help out new mappers who have questions in #mapping-discussion. You can also look for ideas for songs to map in #map-requests, and find others to test your map in #map-testing-requests.