How were fossil fuels formed including the roles of the sun and plants?

The Sun passed solar energy to the plants, and plants were eaten by animals. When the plants and animals died and started decaying, some of them got buried deep under the ground for many millions of years, where they turned into fossil fuels like coal, gas and crude oil.

We burn that coal and oil to turn them into heat energy. Heat energy is transformed in power plants into electricity that goes through the power lines to our homes, then powers our televisions, computers, etc.