Shift-left testing focuses on integrating QA with Dev early in the development cycle, while continuous testing synchronizes QA with Dev and Ops processes to achieve business goals. Continuous testing delivers more thorough results by enabling end-to-end testing, achieving earlier insights, providing better root-cause analysis, refining user experience, being proactive, and going all-in with DevOps. To take testing to the next level, shift-left is a building block but isn't enough; instead, transitioning to holistic continuous testing where frequent tests are distributed across the pipeline and real-world usage data is included is necessary.