Best Practices for Using Power Query in Power BI to Clean and Transform Data Power Query in Power BI is a powerful tool for data extraction , transformation , and loading (ETL) . It allows users to clean, reshape, and transform raw data into a structured format that is ready for reporting and analysis. To get the most out of Power Query, here are some best practices to follow when cleaning and transforming data: 1. Understand the Data Source Explore the Data Before Transformation : Familiarize yourself with the structure and quality of the data before making any changes. Check for missing values, duplicates, or inconsistencies. Document Data Sources : Always keep track of the data sources used, especially when combining multiple sources, for easier troubleshooting and updates. 2. Load Only Relevant Data Filter Data at the Source : Before loading large datasets, apply filters to import only the relevant data into Power Query. This improves performance and ensures you’re working wit...