To explain my project. A DAX question — calculating the number of days between Order_Date and Delivery_Date for products. The difference between SUM and SUMX. How many Power BI reports I have created. Whether slicers can be pinned to a dashboard. Questions related to Row-Level Security (RLS). How you manage reports and dashboards after they are published to the Power BI Service. How you handle dataset refresh strategies, including incremental refresh and scheduled refresh. How you manage performance optimization in Power BI (DAX optimization, model optimization, reducing visuals, etc.).