Fortunately, WS2812B used here have these two components pre-attached; see R1 (75R) and C1 (100n) in our WS2812B module. Here is a well prepared code for addressable LED strips/rings, good for ...

If you’d like to skip needing to use a second Arduino, we’ve seen some other tools available for debugging Arduino code that can run straight from a connected PC instead.

Official Arduino Example Tutorials: The Arduino computer software is loaded with tons of examples for you to use in your own code or to run through as a learning experience.