Java
Spring Transactions for Beginners: Make Database Changes All or Nothing
Learn Spring transactions step by step: build a JDBC checkout, observe real rollback, avoid proxy traps, and run 24 passing integration tests.
Hands-On
Pumpkin Patrol: Build a Tiny Halloween Browser Game with JavaScript
Play Pumpkin Patrol, a tiny Halloween browser game, and explore its tested JavaScript rules, Canvas graphics, touch controls, UML, and BPMN.
Artificial Intelligence
Spring and Physical AI for Beginners: Build a Tested Robot Mission Coordinator
A warehouse employee asks a robot to bring a parts bin to the packing station. The request sounds simple. The software has to answer several different questions: What does the employee mean? Is the destination allowed? Is the observation current? Did the robot accept the job? Did the bin actually Read more
Java
Domain-Driven Design with Spring for Beginners: From Business Rules to a Tested Application
Learn DDD with Spring through a complete ordering application: bounded contexts, aggregates, money, JPA, transactions, events, UML, BPMN and 32 passing tests.
Java
Spring Boot and Keycloak OIDC for Beginners: Login, Secure APIs, and Understand Every Step
Adding a login button to a Spring application is easy. Understanding what happens after someone clicks it takes a little more work. Who checks the password? Why are there several tokens? Why can a logged-in user still receive a 403? And why does an API need different security settings from Read more
Java
Spring Boot for Beginners: Build, Understand and Test Your First Java REST API
Learn Spring Boot step by step with a complete Java REST API, validation, JPA, transactions, 28 passing tests, UML and BPMN diagrams.
Artificial Intelligence
AI Agent Evaluations: Test Business Outcomes Before You Ship
Verify AI agents through business outcomes, independent evidence and clear release criteria. Includes UML, BPMN and an optional tested Python download.
Artificial Intelligence
Claude Code Beyond the Gimmicks: What /advisor and prompt-audit Are Actually Good For
Use Claude Code’s advisor and prompt-audit with clear responsibilities and reviewed changes. Includes a twelve-command cheat sheet, BPMN and UML.
AI Business & Operations
Claude or ChatGPT, Claude Code or Codex: Should a Software Company Buy Both?
Choose one primary AI environment, test the alternative on real work, and buy both where the evidence supports it. A practical guide with tested economics, BPMN and UML.
Artificial Intelligence
Neural Networks, Machine Learning and LLMs: A Complete Beginner’s Guide
Understand machine learning, neural networks and LLMs step by step, with tested Python examples, clear diagrams and an honest guide to data, training and evaluation.