Go: Error handling tutorial

This series of articles gives an intro­duction to error handling in Go.

1. Errors explained
   Go uses return values to indicate errors.
2. Create a custom error
   How to handle an error and how to create custom error types.
3. Panic explained
   Go uses panic for exceptional errors.
4. Recover from a panic
   How to recover from a panic and update the return value.
5. Stack traces
   A stack trace is a list of active method calls at a certain point in time during the execution of a program.