In "Debugging 101" with Dan Darkin from Start Software, you will learn about various debugging techniques and tools in the context of Alpha Anywhere. Dan emphasizes the importance of logging and error handling for identifying and resolving issues in code. He demonstrates how to add error handling to an Ajax function using the "R error" statement and create customer-friendly error messages. Dan also discusses the use of logging for tracking errors and monitoring new functionality, and the importance of logging detailed error messages. Additionally, he demonstrates how to use a debugger to identify and fix errors in code, such as a variable being assigned a character string instead of a numeric value. Dan concludes the video by answering audience questions on debugging techniques and the utility of debugging features like the underscore debug method.