I have read https://lintian.debian.org/ but do not understand what that means in simple words. Which are examples of debian policy rules to be violated and detected by lintian?
What is Lintian for?
lintian
Lintian is a quality assurance tool that runs automated checks on various aspects of packages conformity to the Debian policy. If a package don't respect one of the rules, the issue is reported in the Lintian Reports database.It helps packager to get metrics to build better packages.