The summary.
BACK UP YOUR REPOSITORIES INDEPENDENTLY OF THE PLATFORM
Account loss or platform failure otherwise loses everything.
And for open source, contributors participate where they already have an account.
THE DESCRIPTION DETERMINES THE QUALITY OF REVIEW
State what the change does, why, how to verify it, and what to focus on. Keep the change small — large proposals receive superficial review, reliably.
Review promptly; waiting blocks the author and the change diverges.
A DEFECT THAT CANNOT BE REPRODUCED USUALLY CANNOT BE FIXED
Reproduction steps, environment, version and exact errors are what make an issue actionable.
Close very old issues, stating why — a tracker full of things nobody will do conceals what matters.
PIPELINE SECRETS MUST NEVER BE EXPOSED TO OUTSIDE CONTRIBUTIONS
And third-party pipeline steps execute with your permissions, so pin their versions.
CODE PUBLISHED WITH NO LICENCE GRANTS NO RIGHTS
Nobody may legally use it. And copyleft terms can require publishing your own source, depending on how you use and distribute the code.
FOR ANY SUBSTANTIAL CONTRIBUTION, AGREE THE APPROACH FIRST
Unsolicited large changes are frequently declined, and the effort is wasted.