Shift-left testing involves integrating testing early in the software development life cycle to identify issues early. Test automation uses tools to efficiently run repetitive tests to improve coverage and reduce errors. Continuous integration and continuous testing automate testing as code is merged to maintain quality. Exploratory testing complements automation by creatively exploring software. Performance testing ensures reliability under heavy loads by simulating realistic conditions. Adopting these advanced testing methodologies enhances reliability by enabling early issue detection throughout development.