--- title: Introduction to DAX: Visually Explained | Power BI Course 27 description: An introductory lesson on DAX (Data Analysis Expressions) in Power BI, covering the full learning roadmap and foundational concepts. Explains the two main... canonical: https://daily.dev/posts/introduction-to-dax-visually-explained-power-bi-course-27-zpdfggyzd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Introduction to DAX: Visually Explained | Power BI Course 27 | daily.dev og:description: An introductory lesson on DAX (Data Analysis Expressions) in Power BI, covering the full learning roadmap and foundational concepts. Explains the two main... og:url: https://daily.dev/posts/introduction-to-dax-visually-explained-power-bi-course-27-zpdfggyzd og:image: https://api.daily.dev/og/posts/zPDFGGYzd.png og:image:alt: Introduction to DAX: Visually Explained | Power BI Course 27 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Introduction to DAX: Visually Explained | Power BI Course 27 **[Data with Baraa](https://daily.dev/sources/datawithbaraa)** · 46 min read · 1 upvotes · 0 comments ## Summary An introductory lesson on DAX (Data Analysis Expressions) in Power BI, covering the full learning roadmap and foundational concepts. Explains the two main types of DAX calculations: calculated columns (persisted data) and measures (on-the-fly calculations). Covers DAX syntax basics, when to use columns vs. measures vs. Power Query vs. SQL/Python, the four 'homes' of DAX (calculated columns, calculated tables, measures, and visual calculations), implicit vs. explicit measures, quick measures, and practical tips for validating measure results. Emphasizes understanding concepts over memorizing 200+ functions, and recommends pushing data preparation upstream to SQL/Python when possible. ## Full article daily.dev links to this article rather than hosting it. 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