The Library · Insights
Deep dives across data, automation & AI
981 in-depth articles — from Excel foundations to production machine learning. Filter by topic or difficulty to find exactly what you need.
AI & Machine LearningPractitioner
Implementing Agent Tool Calling with Fallback Chains: Handling Tool Errors, Timeouts, and Partial Results in Production
Tool failures are inevitable in production AI agents — the question is whether your system handles them gracefully or catastrophically. This lesson builds a complete fallback chain framework from error classification through LLM-aware partial result handling, with real code you can deploy today.
22 min read
AI & Machine LearningPractitioner
Implementing Semantic Routing in LLM Applications: Classifying User Intent to Dispatch Queries Across Specialized Chains, Indexes, and Agents
Learn how to build a production-grade semantic router that classifies user intent and dispatches queries to specialized handlers. Covers embedding-based and LLM-based classification, hybrid routing with confidence thresholds, and wiring everything to real downstream chains, indexes, and agents.
25 min read
AI & Machine LearningPractitioner
Translating Business Requirements into AI Task Specifications: A Practitioner's Framework for Scoping, Decomposing, and Documenting LLM Use Cases Before Building
Most AI projects fail not because of bad prompts or wrong models — but because nobody translated the business need into a clear specification before building. This lesson gives you a complete practitioner's framework for interrogating requirements, decomposing workflows, and writing AI task specs that actually drive successful implementation.
26 min read
SQLPractitioner
Geospatial Queries in SQL: Using PostGIS and Spatial Functions to Filter, Measure, and Join Location-Based Data
PostGIS turns PostgreSQL into a full-featured spatial database. Learn how to store, index, filter, measure, and join location data using geometry types, spatial predicates, and real-world radius and polygon queries — with production-grade performance patterns included.
22 min read
Power AutomatePractitioner
Automating SharePoint Document Library Version Control with Power Automate: Archiving, Restoring, and Enforcing Retention Policies Across Sites
Learn how to build a production-grade version governance system in Power Automate that automatically archives document versions, enables self-service restoration, and enforces configurable retention policies across SharePoint sites — with a complete audit trail behind every action.
23 min read
Power AppsPractitioner
Canvas App Delegation-Safe Search: Building Real-Time Filtered Galleries with StartsWith, Combo Boxes, and Server-Side Query Patterns for Large Dataverse Tables
Building a gallery search that works on 500 rows is easy. Building one that works correctly on 50,000 rows without silently missing records is a different challenge entirely. This lesson teaches you exactly which functions delegate to Dataverse, how to chain StartsWith and Combo Box selections into server-side queries, and how to validate your delegation posture before shipping.
22 min read
Power BIPractitioner
Implementing Power BI Metric Alerts and Anomaly Detection with Smart Narratives to Deliver Automated Insight Summaries for Enterprise Stakeholders
Learn how to build a complete automated intelligence pipeline in Power BI — from threshold alerts and AI-powered anomaly detection to Smart Narratives that generate natural-language explanations and Power Automate flows that deliver insights to stakeholders before they think to ask. This lesson covers production-ready DAX, tuning strategies, and multi-audience routing for enterprise deployments.
25 min read
Power BIPractitioner
DAX Event-in-Progress Pattern: Calculating Overlapping Intervals, Headcount Snapshots, and Concurrent Activity Metrics Across Date Ranges
Standard DAX aggregations fail when you need to answer "what was happening on this date?" across interval-based data. This lesson teaches the Event-in-Progress pattern — the definitive approach for headcount snapshots, concurrent activity metrics, and any scenario where your data has start dates and end dates instead of point-in-time events.
22 min read
Power BIPractitioner
Mastering Power BI Drillthrough Pages: Building Context-Aware Detail Views with Filters, Back Buttons, and Cross-Report Navigation
Drillthrough pages are one of the most powerful — and most misunderstood — features in Power BI. This lesson teaches you how to build production-ready detail views that pass the right filter context, navigate cleanly in both directions, and even bridge across separate report files with cross-report drillthrough.
26 min read
Power QueryPractitioner
Implementing Custom Window Functions and Running Calculations in Power Query M: Rolling Averages, Cumulative Totals, and Rank-Based Partitioning Without Native Window Support
Power Query M has no native window functions — no OVER, no PARTITION BY, no ROWS BETWEEN. This lesson teaches you to build rolling averages, cumulative totals, partitioned ranks, and lag/lead functions from scratch using M's list operations and grouping patterns, packaged into a reusable function library you can use across any project.
24 min read
Power QueryPractitioner
Implementing Column-Level Data Profiling and Statistical Summaries in Power Query: Distribution Analysis, Outlier Detection, and Quality Metrics for Practitioner Workflows
Learn how to build a reusable M code framework that automatically profiles every column in your Power Query pipeline — computing completeness rates, statistical distributions, IQR and Z-score outlier flags, and pass/fail quality gates on every refresh. Stop discovering data problems after the model is built.
24 min read
Microsoft ExcelPractitioner
Building a Custom Excel Task Pane with VBA and HTML: Design Interactive Side-Panel Interfaces for Professional Workbook Applications
Learn how to build a professional Excel task pane using VBA and embedded HTML, creating a persistent side-panel interface with two-way communication between JavaScript and VBA. Go from raw UserForm to a fully styled control panel with live KPIs, navigation, filters, and action buttons.
25 min read