1. The document provides an overview of best practices in high school mathematics including learning progressions, assessments, warm ups, interactive activities, and examples of specific math topics and lessons. 2. Warm up activities include "Which one doesn't belong?", estimation, number talks, and interactive games. Assessments resources include Illustrative Mathematics and online tools. 3. Interactive activities incorporate technology like Desmos, Kahoot, and Nearpod to engage students in collaborative games and lessons focused on algebra, geometry, and other math topics.