Program Starter Best Practices: Structure, Setup, and Tips

Clarity: Make project purpose and scope obvious immediately.
Onboarding speed: New contributors should be able to run the project in minutes.
Maintainability: Keep a predictable structure and documented conventions.
Reusability: Make components modular so they can be reused across projects.

/src — application source code (language-specific layout inside).
/pkg or /lib — reusable libraries or modules.
/cmd — executables or entry-point scripts (for multi-binary projects).
/tests — integration / end-to-end tests. Unit tests colocated with code if preferred.
/docs — high-level documentation and design notes.
/scripts — helper scripts (build, deploy, data migrations).
/configs — example and environment-specific config files.
/examples — minimal demonstration apps or usage snippets.
README.md — project overview, quick start, prerequisites, and common commands.
CONTRIBUTING.md — contribution guide and code style rules.
CHANGELOG.md — release history and notable changes.
LICENSE — license file.
.github/ — CI workflows, issue templates, PR templates.

README.md: quick start (install, run, test), one-line purpose, links to docs.
Makefile / taskfile / npm scripts: single command entry points (build, test, lint).
CI config (GitHub Actions, GitLab CI): run tests, lint, build on PRs.
Linting & formatting config: (ESLint, Prettier, Black, EditorConfig).
Dependency manifest: lockfile committed for reproducible installs.
Environment examples: .env.example with documented variables.
Security: secret scanning, Dependabot/renovate config for deps.
Testing: minimal integration test that verifies the app boots; unit tests for core logic.
Versioning: semantic versioning and automated changelog or release notes.

One-command start: combine setup steps into a single script (setup.sh, make setup).
Good defaults: sensible config values and clear overridable environment variables.
Fast feedback loop: prioritize fast unit tests and use test doubles for slow integrations.
Meaningful errors: log actionable errors and how-to-fix messages.
Document common workflows: branching, releasing, and debugging.
Stable APIs: design public module interfaces to be backward-compatible or versioned.

Separation of concerns: keep business logic separate from I/O and framework code.
Dependency inversion: depend on interfaces/abstractions, not concrete implementations.
Small modules: functions/classes should have a single responsibility.
Explicit boundaries: define module contracts and public vs internal APIs.
Configuration over code: make behavior configurable rather than hard-coded.

Secrets management: never commit secrets; use environment stores or vaults.
Input validation and sanitization: validate all external inputs.
Logging & metrics: structured logs, request IDs, basic health and metrics endpoints.
Error handling: capture and report errors with context, avoid leaking sensitive info.
Automated dependency checks: run vulnerability scans regularly.

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