I’m going to assume you are asking for a general summary of cellular respiration given your question.
Cellular respiration is a sequence of events that occur within a cell to break down glucose to make ATP. Firstly, glucose is transported into the cell and broken down through the process of glycolysis. A product of glycolysis is a molecule known as pyruvate, which is converted to acetyl-CoA. This acetyl-CoA molecule enters the citric acid cycle where it is oxidized and produces the electron carriers NADH and FADH+. These carriers transport electrons from the citric acid cycle to the electron transport chain. The electrons donated to the electron transport chain produce energy which is used to drive the synthesis of ATP that your body needs.
This is a very general description of what cellular respiration is. I have left out a lot of details to make the understanding easier because cellular respiration is a complex process.
