work link:
https://www.tinkercad.com/things/5ksEIBXBzVF?sharecode=WJ2fMyhopRC04Nhgfj-Jo3MEWt1Xy0-NWuT9XDwIaNg
1.LED-blink circuit
2.Breadboards & more LEDs
3.Fading LED circuit
4.RGB LEDS
5.Arduino Class Input/Output
Yining Zhang’s Arduino Intro Exercises