This micro-certification course is designed for educators seeking to enhance their knowledge and instructional practice in high school mathematics. Grounded in current research and best practices, this course supports teachers in refining how they plan, teach, and assess general high school math content. Participants will explore a variety of high-impact instructional resources and frameworks—such as low floor, high ceiling tasks, Building Thinking Classrooms practices, writing in mathematics, student portfolios, and problem-based learning models—to create more engaging and equitable math classrooms. The course encourages reflection on existing teaching strategies and offers actionable tools to improve student engagement, mathematical thinking, and understanding.