Pivot table is the most commonly used function to do analysis data in sheets.
You can create a pivot table easily in google sheet with the data menu pivot commend. Refer the picture.
Very simple steps with an added feature of sorting the value in pivot table in the options.
I have created a data sheet with a sample pivot table for you to understand it and work on the sheet to get practice of pivot table function.
In the sample data; I have also used a date and text function to fine the month representing the transactions. You can use the function to create a meaning full pivot and reports can be generated easily. Please give your feedback after using the sample data in the following data.