I was wondering if there is a free simulator/emulator that I can run either online or on a Windows computer to let me test my scripts and more importantly my wiring, as I am new to building circuits. I also need to be able to build the circuits in a 'real world' (breadboard) view as I find reading circuit layout very confusing and even more challenging to create. The closest that I have found is Fritzing (http://fritzing.org) but they don't let me test my circuits and Autodesk Circuits (https://circuits.io/) but they only offer an Arduino emulator.
I currently do not yet own an actual Raspberry Pi nor all the components that I think I will need.
I thank you all in advance for any advice, and I apologize if someone else already asked this question.