You could try printing off the individual web pages here (along with all the topics on the left side):
https://racerender.com/RR3/docs/Contents.html
I mostly just tried each individual piece: Added a display object, selected a field from my data and then played around with each of the properties to see what they did, but I referenced that documentation a lot, especially early on. Some of it is a little outdated at this point, but it's usually close enough that you can look for something similarly named or in a similar location to find the exact piece that you need.
There's a sample data file and video available at the bottom of this page:
https://racerender.com/Developer/DataFormat.html
I found that particularly helpful when trying to understand why my lap times weren't working even though I had the correct format for each lap. In my case, I wasn't including a first line of "# RaceRender Data".