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Tinkercad - https://www.tinkercad.com is an excellent tool that allows you to simulate Arduino-based systems (and a lot more). You can (perhaps you SHOULD) simulate all exercises and even your own designs before trying them on real hardware. It also allows you to do programming using blocks. You can download / copy-paste the generated code later into Arduino IDE to program the real Arduino board, rather than having to write it from scratch.
Create a new personal account on Tinkercad website (you can also use your Google account to log in). The Then select Circuits on the left pane, and click Create new Circuit.
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