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Regarding this, how does supply side economics work?

Supply-side economics assumes that lower tax rates boost economic growth by giving people incentives to work, save, and invest more. A critical tenet of this theory is that giving tax cuts to high-income people produces greater economic benefits than giving tax cuts to lower-income folks.

what is demand side approach? Definition of demand-side. : of, relating to, or being an economic theory that advocates use of government spending and growth in the money supply to stimulate the demand for goods and services and therefore expand economic activity — compare supply-side.

Beside this, what is better demand side or supply side economics?

Policies that support demand-side economics are focused less on the wealthy and more on the lower and middle classes. While supply-side economists expect a little government regulation of the free market, demand-side economists expect a more active government.

Is Keynesian economics demand side?

Keynesian economics is considered a "demand-side" theory that focuses on changes in the economy over the short run.