Looking for a simulator/game for learning to make PCB's/computers?

I'd like to learn how to design little dev boards/PCB's/computers/electronics.

However learning electronics is somewhat daunting because there's so much to learn but also hard because it requires physically making and connecting things to see if they work.

I wondered if there was some sort of electronics design emulator/simulator/teaching tool/game that would allow you to virtually design things and see if they work and also somehow teach you along the way what things do and why they are done a certain way?