Microsoft
Microsoft Developer Network: Coding Techniques and Programming Practices
This article provides coding techniques and programming practices for improving the quality of source code.
BBC
Bbc Bitesize: Development and Testing: Test Plan
Learn how developers use test plans that check a range of types of data under different circumstances.
BBC
Bbc Bitesize: Development and Testing: Test Driven Development
See why programming and debugging can be part of the same development process.
Khan Academy
Khan Academy: Writing Clean Code
Practice writing clean code in these practice problems.
Other
Perforce: Eight Version Control Best Practices
Learn key version control best practices and how to apply them.