Dive into the third part of a comprehensive video tutorial on tool development in Unity. Learn essential techniques such as creating and referencing prefabs, implementing button-triggered spawning, and refactoring positioning code. Explore advanced concepts including tangent space, rotations, transform hierarchy, and performance optimization. Master random rotation implementation, mesh placement previews, and matrix operations. Tackle challenges like fixing spazzy rotations and creating prefab select buttons. Gain insights on assignments, comparisons between high school and FutureGames students, and thoughts on Entity Component System (ECS). This two-hour session, originally streamed for FutureGames students, offers in-depth knowledge and practical skills for Unity developers looking to enhance their tool creation abilities.