First part of Statistical Thermodynamics includes: Introduction, Ensembles, Types of Ensembles, Thermodynamic Probability, Boltzmann Distribution, Lagrange's Undetermined Multipliers, Partition Function, Types of Partition Functions, Thermodynamic Properties in terms of partition Function, Heat Capacity, Heat Capacity of Monoatomic Solids, Dulong-Petit law, Einstein Model for solids, 3rd Law and Residual Entropy