How I structure custom WordPress plugins
Folder structure, service classes, hooks, and small patterns that make plugin code easier to extend.
A good WordPress plugin structure keeps hooks close to the behavior they activate and avoids turning the main plugin file into a long procedural script.
I usually separate admin screens, frontend behavior, API routes, and domain services. That makes each part easier to test and easier to replace later.
Small service classes help when plugin behavior grows beyond a few hooks. They also make dependencies more obvious than global functions scattered across files.
The goal is not to over-engineer WordPress. The goal is to keep future changes boring.