Hello and welcome.
There is a ton of information in the GUIDES SECTION of our forum for clarification on most anything.
Here is a great link with a great explanation. Note all of our circuits require a power supply with negative (-) polarity and the few PNP Fuzz circuits we carry incorporate a charge pump to reverse it. This is common to most DIY Pedal Projects with some exceptions of course. We also utilize a protection diode in the majority of our circuits where power connects. That said I appreciate what you are saying however just note that each of our 80 unique projects require negative polarity.