The document discusses various topics related to radiation therapy treatment planning including: 1. Photon and electron dose distributions, isodose distributions, beam profiles, corrections for obliquity and tissue heterogeneity. 2. Essentials of treatment planning including goals of conformal therapy to deliver 100% dose to tumor and 0% to critical structures, and use of 3D imaging and planning. 3. Algorithms for dose calculation including data-driven, model-driven, and factors for evaluation such as calculation accuracy and scatter integration.