How to Read the Arduino Schematic Diagram | LEARN @ CIRCUITROCKS
Tinkercad & Arduino: How to Design and Simulate Circuits | All3DP
Arduino Circuit Design Program - YouTube
How to Design a Custom Arduino Shield Board | Blog | CircuitMaker
ARDUINO - Digital Design
Circuit design software that makes it easy to design, document, and debug electronics projects for the breadboard (more info in the comments). Would you find this useful? (x-post with r/ArduinoProjects) : r/arduino
Design projects using arduino, raspi, esp32 or 8266, stm32 by Varungonzy | Fiverr