I would like to have a report of my expenses by category showing each month separately. Is that possible?

Hey there janinegscampos-i,

Welcome to the QuickBooks Community! Thanks for reaching out to us here. QuickBooks Online is a great software to use. It allows your to run reports that provide useful information. Being able to find the correct report is important. I can provide some information.

There currently isn't a report which shows expense by category. However, you can find a report called  Expenses by Supplier Summary. You'll be able to filter this report to get the dates you need. I can see that having the specific report for Expense by category would be beneficial for you. I recommend leaving feedback by heading to the Gear icon and selecting the Feedback option. These comments are viewed and considered by our developers as they create new features and updates for QuickBooks. Here is a list of reports included in your subscription. 

If you have any other questions, feel free to reach out here.