Write a query to find the total amount you spent in each category (Groceries, Entertainment, etc.).

Assuming you are using SQL and you have a table named 'expenses' with columns 'category' and 'amount', you can use the following query:

SELECT category, SUM(amount) as total_amount
FROM expenses
GROUP BY category;

Here's the step by step explanation:

1. SELECT category, SUM(amount) as total_amount: This line is selecting the 'category' column and the sum of the 'amount' column for each category. The SUM(amount) function adds up all the values in the 'amount' column. The as total_amount part is renaming the column for the sum of the amount to 'total_amount'.

2. FROM expenses: This line is specifying the table where the data is coming from, which in this case is the 'expenses' table.

3. GROUP BY category: This line is grouping the selected columns by 'category'. This means that the output will have a row for each category, and the 'total_amount' will be the sum of the 'amount' for each category.