Articles
Explore in-depth tutorials and guides across data analytics, automation, and AI. Filter by topic or difficulty to find exactly what you need.
Data Engineering🌱 Foundation
Scheduling and Backfilling Historical Data Loads in Airflow: Catchup, DAG Runs, and Idempotent Pipeline Design
Learn how Airflow's interval-based scheduling model really works — and how to safely backfill months of historical data without duplicating records. This hands-on lesson covers catchup behavior, the backfill CLI, and the idempotent design patterns every data pipeline needs.
16 min read
Data Engineering🌱 Foundation
Understanding Data Pipeline Triggers: Time-Based, Event-Driven, and Sensor Patterns
Knowing when your pipeline should run is just as important as knowing what it should do. This lesson breaks down the three core trigger patterns — cron schedules, event-driven triggers, and sensors — with real code examples and a decision framework you can use immediately.
17 min read
AI & Machine Learning🌱 Foundation
Document Ingestion Pipelines: Loading, Cleaning, and Preprocessing Text for RAG
Before your RAG system can answer questions intelligently, it needs clean, well-structured text to work with. This hands-on lesson walks you through building a complete document ingestion pipeline in Python — from loading PDFs and Word files to cleaning noise, chunking text, and enriching chunks with metadata.
15 min read
AI & Machine Learning🌱 Foundation
Conversation Design for LLMs: Structuring System Prompts, Roles, and Message Threads with the Chat Completions API
Most LLM applications fail not because the model is wrong, but because the conversation is designed poorly. Learn how to structure system prompts, manage multi-turn message threads, and inject dynamic context using the Chat Completions API — the skills every serious LLM builder needs.
15 min read
AI & Machine Learning🌱 Foundation
From Vague to Precise: How to Diagnose and Fix Prompts That Return Unhelpful AI Responses
Most AI responses that miss the mark aren't the AI's fault — they're the prompt's fault. This lesson teaches you a five-point diagnostic framework to identify exactly why your prompt failed and apply targeted fixes that get you useful, precise answers every time.
16 min read
SQL🌱 Foundation
Datetime Arithmetic and Interval Calculations in SQL: Converting, Truncating, and Computing Durations Across Database Platforms
Dates and times are everywhere in data work, but SQL's datetime functions vary wildly across platforms — and the edge cases produce wrong answers that look right. This lesson teaches you how to cast, truncate, and subtract dates, and how to use interval arithmetic across PostgreSQL, MySQL, BigQuery, and SQL Server.
14 min read
Power Automate🌱 Foundation
Getting Started with the Power Automate Interface: Navigating the Designer, Understanding Flow Structure, and Running Your First Test
Power Automate can feel overwhelming before you know where everything lives. This hands-on lesson walks you through the designer, explains how triggers and actions work together, and gets you building and testing a real flow from scratch — no prior experience required.
16 min read
Power Apps🌱 Foundation
Power Apps Data Sources Explained: Tables, Records, and Collections for Absolute Beginners
Confused about where data lives in Power Apps and how to work with it? This lesson builds your understanding from first principles — covering tables, records, fields, external data sources, and collections — so you can confidently connect data to any app you build.
15 min read
Power BI🌱 Foundation
Implementing Power BI Apps to Package and Distribute Enterprise Reports to Large Audiences at Scale
Stop sharing workspaces and start delivering polished, governed report experiences with Power BI Apps. This hands-on lesson walks you through building, configuring, and publishing an enterprise app — including audience groups, navigation design, and seamless update workflows.
17 min read
Power BI🌱 Foundation
DAX Variables in Practice: Using VAR and RETURN to Simplify Complex Measures
Complex DAX measures don't have to be unreadable nightmares. Learn how to use VAR and RETURN to break calculations into clear, named steps — and discover the one surprising behavior about variables that every DAX developer needs to understand.
14 min read
Power BI🌱 Foundation
Choosing the Right Visualization in Power BI: Bar Charts, Line Charts, Tables, and Cards Explained
Most Power BI beginners pick charts by instinct — and end up with dashboards that confuse instead of communicate. This lesson teaches you the one question you need to ask before choosing any visualization, then walks you through the four chart types that cover 90% of real business reporting needs.
16 min read
Power Query🌱 Foundation
Navigating the M Standard Library: A Practical Reference to Built-In Functions, Namespaces, and When to Use Each
The M standard library has over 700 built-in functions — and most Power Query users never get a proper map of the territory. This lesson teaches you how the library is organized by namespace, what each major namespace covers, and how to confidently look up and use any function you encounter.
16 min read