There are two main types of energy sources: renewable and non-renewable. Renewable sources include solar, wind, hydro, and geothermal energy, which are sustainable and environmentally friendly. However, they can be intermittent and location-dependent. Non-renewable sources like fossil fuels (coal, oil, natural gas) are reliable but contribute to pollution and climate change.

To save energy, one should practice energy conservation by turning off lights and appliances when not in use, using energy-efficient appliances, insulating homes, and using public transportation or carpooling. Additionally, investing in renewable energy sources and supporting policies that promote clean energy can help reduce our dependence on non-renewable sources and mitigate the impacts of climate change.