RGB LED not responding to Serial Monitor Input - Programming Questions - Arduino Forum

Good afternoon, I recently started learning Arduino coding and some basic circuit building from Paul McWhorter on (great teacher btw). I was following his tutorial of building a circuit with an RGB LED that responds to the Serial Monitor Input. However, I haven't been able to get my code to work and I cannot figure out why. My code looks very similar to Paul's in his video and as far as I can tell, my circuit looks like it is built correctly. What am I missing here? (link

RGB LED Code not entering setup - Programming Questions - Arduino

SOLVED]Dfficulties with turning on LED's based on a String input

Serial Print Question - Programming Questions - Arduino Forum

Guide for WS2812B Addressable RGB LED Strip with Arduino

L7: Crossfading RGB LEDs - Physical Computing

Colour Changing RGB LED, button problems - LEDs and Multiplexing

Odd behavior in an RGB LED - LEDs and Multiplexing - Arduino Forum

Need help with reading a string - Programming Questions - Arduino

Solved I need a code for Arduino UNO that makes the RGB LED

not declared in this scope' (LIBRARY ISSUE?) - Avrdude, stk500

How to control an RGB LED with Arduino

help] serial communication: vvvv > Arduino > APA102 LEDs

Display glitching while connecting to WiFi: ESP32S3+8048S043