What are broad types of efficiency techniques in testing?

Broad types of efficiency techniques in testing include test automation, which reduces manual effort and speeds up the execution of repetitive tasks; test optimization, which involves prioritizing and selecting the most impactful tests to run; and continuous testing, which integrates testing into the software development lifecycle for immediate feedback. Additionally, using risk-based testing focuses resources on the most critical areas, while leveraging tools for test management and reporting can streamline processes and improve collaboration.