There's no PoW-based cryptocurrency can be mined for free. You'll need to pay for the hardware and electricity.
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.
Hire a software developer to create wallet with built-in mining feature. But take note people still need to pay for electricity which needed to run their computer.