I will look into it myself but I m pretty tech illiterate, could you give me a quick rundown>?
Everytime you buy something with cryptocurrency, it is a taxable event. At least in the US, cryptocurrency is not a currency but a property. Of course it only matters if you are making profits but the rules are more complicated.
Stable coins don't change value so when you buy/sell their value is still the same as they are pegged to the dollar.
Can you convert cash directly to stable coins?
At least at Coinbase yes you can.
I know on Edge, for example, you can buy USDC in your preferred flavor with a debit card through Banxa.