There's no PoW-based cryptocurrency can be mined for free. You'll need to pay for the hardware and electricity.
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Is there a method that can be mined directly using a computer, without the need for professional equipment or complex mining pool design and construction, so that more people who do not understand technology can participate?
For example, download a wallet and click in the wallet to turn on or off mining.
In past, service called Forkgen let you create Bitcoin fork easily with relative low cost[1].
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For me, who is not technical, this is quite difficult.