Ramda's documentation is the place to go when you are looking for a function to use, trying to remember how to use a function, want to view a function's source code on GitHub, or open it in the Ramda REPL.
The Ramda REPL is something I used all the time when learning Ramda, for all the functions are automatically loaded in that environment for you to use. You can even get a link to your current state in the REPL and share it with others!
Some official resources of additional note are Ramda's GitHub wiki and the Ramda Cookbook. The wiki contains numerous resources hand-picked by the Ramda folks, and the Cookbook is chock-a-block with Ramda recipes (helpful functions built with Ramda functions).