How can I get free data from WiFi?

I'm curious, how can one obtain free data from WiFi networks? Is there a legitimate way to access the internet without incurring any costs, or are there potential risks and legal implications that I should be aware of? I'm looking for a SAFE and reliable method to connect to the web without having to pay for a data plan. Could you please elaborate on the steps and considerations I need to take in order to achieve this goal?