





I have an Arduino Uno (7–8 years old) and a fairly new ESP32 WROOM, but I currently have no other components(not even a breadboard or LEDs).
What is the most cost-effective way to learn as much as possible about electronics, microcontrollers, and these boards with the minimum number of components I need to purchase? My goal is simply to understand how things work and experiment hands on, while keeping the total cost as low as possible.