How humans make forest fires?

Answer 1

Usually by being drenched in some form of accelerant and lit with a match.

Spontaneous human combustion is a a topic that has not been proven beyond a reasonable doubt. In most cases there have been sources of ignition and other factors involved.

Answer 2

Humans start forest fires in many ways, most of which are caused by carelessness. A couple of them are throwing a lit cigarette on the ground, especially around dry leaves, sawdust or other materials that can catch on fire, and not putting a camp fire out totally.

Answer 3

Humans can accidentally start forest fires through activities like campfires left unattended, improper disposal of cigarettes, or equipment malfunction. Intentional human-caused fires can also occur through arson or land clearing practices that get out of control.