Electricity bills are calculated from the reading taken monthly on your electric meter. The best way to understand what electricity is, is to think of electricity as water under pressure which can turn your fan and make the lights come on. So the electricity meter is like a water meter measuring how much quantity has been consumed. Like the measure of water is a ‘Liter’, the measure for electricity is called a ‘Kilowatt-Hour’ commonly referred to as a ‘Unit’ of Electricity.
What makes electricity bill high is mainly the use of high electric consuming appliances like AC (Air Conditioners), electric heating appliances like electric cookers including induction cookers and electric kettles, Fridge, etc. Therefor to reduce your monthly electricity bill the first thing to do is to avoid using any electric heating appliances like electric hot plates, induction cookers, electric kettle. Use a gas stove for this purpose, using gas for all heating is much cheaper than paying a high electricity bill. Regarding AC and fridge, use more efficient inverter models of AC and Fridge.