The Library · Insights
Deep dives across data, automation & AI
1262 in-depth articles — from Excel foundations to production machine learning. Filter by topic or difficulty to find exactly what you need.
Microsoft ExcelExpert
Building a Custom Excel Ribbon with VBA and XML: Design, Deploy, and Control Context-Sensitive UI for Professional-Grade Workbooks
Learn how to design, build, and deploy a fully custom Excel Ribbon using RibbonX XML and VBA callbacks. This expert lesson covers dynamic controls, context-sensitive tabs, role-based visibility, and add-in deployment — everything you need to give your workbooks a professional application-grade UI.
26 min read
Career DevelopmentPractitioner
How to Handle a Freelance Data Project That Goes Wrong: Client Disputes, Missed Deadlines, and Recovery Strategies That Protect Your Reputation and Revenue
Every freelance data project hits turbulence eventually. This lesson gives you a practical playbook for diagnosing what went wrong, communicating with clients under pressure, resolving disputes using your contract, and recovering in a way that protects both your revenue and your reputation.
25 min read
Career DevelopmentPractitioner
How to Build a GitHub Profile That Gets You Noticed by Data Hiring Managers
Most data job seekers treat GitHub like a filing cabinet. This complete lesson teaches you how to structure repositories, write READMEs that tell a technical story, and present code that signals professional readiness to hiring managers — with realistic examples throughout.
23 min read
Data EngineeringPractitioner
Designing and Automating Data Warehouse Unit Economics Dashboards: Attributing Storage, Compute, and Query Costs to Teams, Models, and Business Domains in Snowflake and BigQuery
Learn how to extract, model, and visualize Snowflake and BigQuery cost data at the query level — attributing spend to specific dbt models, teams, and business domains. Build an automated cost attribution pipeline with dbt and Airflow and design a dashboard that drives real cost optimization decisions.
22 min read
Data EngineeringPractitioner
Implementing Change Data Capture Pipelines with Debezium: Capturing and Routing Database Events in Production
Learn how to build production-grade CDC pipelines using Debezium and Kafka — from configuring PostgreSQL logical replication to routing, transforming, and consuming database events with exactly-once semantics. This is a complete practitioner-level guide with real connector configurations, SMT recipes, and a working end-to-end example.
21 min read
AI & Machine LearningPractitioner
Implementing Hypothetical Document Embeddings (HyDE) from Scratch: Generating Synthetic Answers to Improve Sparse and Dense Retrieval
HyDE bridges the gap between how users ask questions and how documents store answers — by asking an LLM to hallucinate a plausible answer and using that embedding to search your corpus. This hands-on lesson walks you through building HyDE for both dense vector search and BM25 from scratch, including multi-hypothetical averaging and hybrid fusion.
24 min read
AI & Machine LearningPractitioner
Implementing Tool Result Validation and Error Recovery in LLM Function Calling Pipelines
Function calling pipelines fail in three distinct zones — and most tutorials only handle one of them. Learn how to build complete validation, typed error taxonomies, retry logic, and graceful degradation for production LLM agents that actually stay reliable.
23 min read
AI & Machine LearningPractitioner
Using AI to Summarize, Compare, and Extract Insights from Multiple Documents Simultaneously
Stop summarizing documents one at a time and hoping you catch what matters. This lesson teaches you how to design AI prompt workflows that do genuine comparative reasoning across multiple documents at once — surfacing contradictions, gaps, and structured insights that feed directly into decisions.
20 min read
SQLPractitioner
Multitenancy Query Patterns in SQL: Schema-Per-Tenant, Shared Tables, and Efficient Cross-Tenant Reporting Strategies
Building a multitenant SQL database means every query carries a security contract. This lesson teaches you the three major isolation models, how to write tenant-safe queries with proper indexing, and how to build cross-tenant analytics that scale without leaking data.
21 min read
Power AutomatePractitioner
Automating SharePoint and OneDrive Metadata Tagging with Power Automate: Extracting, Classifying, and Applying Managed Metadata at Scale
Manual metadata tagging never sticks — people are too busy creating documents to classify them consistently. Learn how to build a Power Automate flow that automatically extracts classification signals, resolves SharePoint Term Store GUIDs, and writes managed metadata to document libraries at scale, with AI fallback for ambiguous files.
22 min read
Power AppsPractitioner
Canvas App Delegation Workarounds for Complex Multi-Filter Queries: Combining Local Collections, Incremental Loading, and Hybrid Server-Client Filtering to Handle Large Datasets
Delegation warnings are frustrating, but they're survivable — if you know how to architect around them. This lesson teaches you a layered, production-ready strategy for complex multi-condition filtering on large datasets in Canvas apps, combining server-first filtering, local collections, and incremental loading into a hybrid approach that scales.
21 min read
Power BIPractitioner
Implementing Power BI Datamart with Automatic Schema Detection and Built-In SQL Endpoint to Deliver Self-Service Analytics Without a Dedicated Data Warehouse
Power BI Datamart gives you a managed relational database, a built-in SQL endpoint, and an auto-generated semantic dataset — all without provisioning a single Azure resource. Learn how to build, govern, and connect to a production Datamart for departmental self-service analytics.
24 min read