The original title is: "Golang Beginner Mistakes #4: Learning Interfaces Changed How I Write Go"

Short summary

A Go beginner explains how interfaces finally clicked for them through a practical animal-sound example, progressing from separate functions per type to a single Speaker interface. The article covers Go's implicit interface satisfaction (no implements keyword), the principle of accepting interfaces and returning structs, and cautions against overusing interfaces or the any type. Code examples demonstrate defining and consuming interfaces step by step.

• •Interfaces in Go are about behavior, not data — what a type can do, not what it is
• •Go satisfies interfaces implicitly with no implements keyword or registration
• •Avoid premature interfaces and the any type; define interfaces where they are consumed, not where they are implemented

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