QA starts with clear acceptance criteria.
Testing is stronger when expected behavior is defined before development is complete. That gives designers, developers, and stakeholders the same target.
Protect the critical paths.
Regression checks, API testing, browser testing, role-based flows, and edge-case validation help teams launch with fewer surprises.
Release confidence is built gradually.
QA should run through the project, not appear only at the end when fixes are slower and riskier.