Circuitry and Automation with Microcontrollers: TinkerCAD Circuits -> https://www.tinkercad.com/circuits
This website is free, can be used on a tablet, computer, or phone. I wouldn’t use it on a phone personally because the screen is small, but it is possible. You need an account to use this website
You can use these YouTube videos in this order to learn how to work the circuits:
- Intro to Circuits Part 1: https://www.youtube.com/watch?v=LrOM2GABK1g&pp=ygUpdGlua2VyY2FkIGNpcmN1aXRzIHR1dG9yaWFsIGZvciBiZWdpbm5lcnM%3D
- Intro to Circuits Part 2: https://www.youtube.com/watch?v=A7HpLRWm81Q
- Intro to Circuits with Micro:bit: https://www.youtube.com/watch?v=0PxNKngtF-0