LearnArticlesAboutContact
Sign InSign Up

Become Wicked Smart
with Data

Master everything from Excel and Power BI to AI and machine learning. Structured learning paths built for working professionals.

Start LearningBrowse Articles
ExcelPower BISQLPythonAI / MLPower Query

Projects

Apps our team is building — each one its own product, all launching soon.

Android · ~2 weeks

The Worldwide Authority on Fear

You don't rate fear, fear rates you.

The body's real response — heart rate, jumps, recovery — resolved into one honest number from 0 to 100.

fearscore.com ↗
Certified Fear Score◆ Gold
87
Mortem Manor · Orlando, FL
Resting 62 bpmPeak Δ +58
Launching soon

Wellness that talks back

A coach who knows your whole day.

Tell it about your day like you'd tell a friend — it remembers your patterns and names your next best move.

welliana.com ↗
Jordan · The Strategist
Worked a double and skipped the gym again. Feels like I'm going backwards.
One skipped session isn't the story. Tonight the next best move is sleep — not guilt.
Live at reelxo.com · apps soon

Rated by real audiences

Every title, scored by the XO Rating.

An audience-first blend of IMDb, TMDB, Rotten Tomatoes, Metacritic and ReelXO members — one number you can trust.

reelxo.com ↗
XO8.8
IMDb Spider-Man: Brand New Day 8.1
🍅 Certified Fresh 94%
MC Metascore 89
In development · site coming

Your Family Command Center

Your family, organized.

Schedule, tasks, bills, shopping, recipes and meal planning — one place for the whole household.

Website coming soon

This week

MTWTFSS3456789
Soccer practice · 5:00
Electric bill due
Taco night — plan groceries

Learning Paths

Structured courses that take you from fundamentals to expert-level mastery. Pick your path and start building real skills.

Microsoft Excel

Formulas, VBA, data modeling, and dashboards

112 articles

Power Query

M language, data transformation, and ETL patterns

66 articles

Power BI

DAX, data visualization, report design, and deployment

99 articles

Power Apps

Canvas apps, model-driven apps, and component libraries

33 articles

Power Automate

Cloud flows, desktop flows, and business automation

33 articles

SQL

T-SQL, query optimization, database design

90 articles

AI & Machine Learning

Prompt engineering, RAG, agents, LLMs, and Python for AI

99 articles

Data Engineering

Pipelines, ETL/ELT, data warehousing, and dbt

64 articles

Career Development

Resume optimization, interview prep, and freelancing

64 articles

Latest Articles

LLM Memory Architecture for Enterprise Applications: Conversation History, Summarization Buffers, and Stateful Context Management
AI & Machine LearningExpert

LLM Memory Architecture for Enterprise Applications: Conversation History, Summarization Buffers, and Stateful Context Management

LLMs are stateless by design — every API call starts from zero. Learn how to build enterprise-grade memory systems that handle multi-session persistence, summarization buffers, vector retrieval, and structured state management across long-running AI workflows. This is the architecture that separates production systems from demos.

27 min read
Query Rewriting with Common Subexpression Elimination: CTEs, Derived Tables, and Optimizer Hints for Maximum SQL Performance
SQLExpert

Query Rewriting with Common Subexpression Elimination: CTEs, Derived Tables, and Optimizer Hints for Maximum SQL Performance

Repeated subexpressions in SQL don't just hurt readability — they silently multiply your database's workload, often by 3x to 7x on large tables. This expert lesson teaches you to identify, factor, and verify common subexpression elimination using CTEs, derived tables, temp tables, and engine-specific optimizer hints across PostgreSQL, SQL Server, Oracle, and BigQuery.

28 min read
Integrating Power Automate with Azure Key Vault and Managed Identities: Complete Guide to Secrets Management and Zero-Trust Authentication
Power AutomateExpert

Integrating Power Automate with Azure Key Vault and Managed Identities: Complete Guide to Secrets Management and Zero-Trust Authentication

Hard-coded credentials in Power Automate flows are a production liability waiting to happen. This deep-dive lesson teaches you to architect production-grade credential management using Azure Key Vault, Managed Identities, and automated rotation — eliminating secrets from flow definitions entirely and implementing true zero-trust authentication patterns.

32 min read
Canvas App Governance at Scale: DLP Policies, Connector Whitelisting, and Tenant-Wide Compliance Controls
Power AppsExpert

Canvas App Governance at Scale: DLP Policies, Connector Whitelisting, and Tenant-Wide Compliance Controls

Enterprise Power Apps deployments accumulate governance debt fast — hundreds of apps, unreviewed connectors, and DLP policies that don't do what admins think they do. This deep-dive lesson teaches you the complete governance architecture: how DLP policy layering actually works, how to design connector classification at scale, and how to build automated compliance monitoring using PowerShell and the Power Platform admin APIs.

29 min read
Implementing Power BI Capacity Planning and Autoscale Configuration for Enterprise Premium Workloads
Power BIExpert

Implementing Power BI Capacity Planning and Autoscale Configuration for Enterprise Premium Workloads

Enterprise Power BI deployments fail at scale not because of bad reports, but because of bad capacity architecture. This deep-dive lesson teaches you to model the Analysis Services engine internals, conduct data-driven sizing exercises, configure autoscale with proper cost guardrails, and build proactive monitoring that catches problems before your users do.

30 min read
DAX Cohort Analysis: Building Retention, Churn, and Lifetime Value Measures with GENERATE and Date-Based Segmentation
Power BIExpert

DAX Cohort Analysis: Building Retention, Churn, and Lifetime Value Measures with GENERATE and Date-Based Segmentation

Aggregated metrics lie — retention rates and LTV numbers stripped of cohort context hide whether your business is getting better or worse. This expert-level lesson shows you how to build a complete cohort analysis system in DAX, from data modeling through discounted lifetime value, using GENERATE, two-date-axis design, and precise filter context management.

25 min read
Mastering Power BI Usage Metrics and Audit Logs: Tracking Report Adoption, User Activity, and Governance at Scale
Power BIExpert

Mastering Power BI Usage Metrics and Audit Logs: Tracking Report Adoption, User Activity, and Governance at Scale

Most Power BI teams know how many reports they've built, but not how many people actually use them. This deep-dive lesson walks you through the complete observability stack — from built-in Usage Metrics to the Activity Log REST API — and shows you how to build a scalable usage pipeline, detect governance risks, and connect adoption data to real business outcomes.

28 min read
Implementing Custom Aggregation Engines in Power Query M: Statistical, Weighted, and Conditional Aggregations Beyond Native Group By
Power QueryExpert

Implementing Custom Aggregation Engines in Power Query M: Statistical, Weighted, and Conditional Aggregations Beyond Native Group By

Power Query's native Group By covers the basics, but real-world analytics demands weighted averages, percentiles, conditional sums, and composite statistics. This expert lesson teaches you to build a reusable aggregation engine in M that handles any aggregation type through a clean, config-driven architecture.

23 min read
View all articles
660
In-depth tutorials and guides
9
From Excel to Machine Learning
18
Structured courses to mastery
Free
No paywalls, no gatekeeping

Ready to Level Up?

Join thousands of professionals building data skills that matter. Start your first learning path today — completely free.

Start LearningCreate Free Account