This document discusses different types of microwave resonators including half-wave and quarter-wave transmission line resonators, rectangular cavities, and circular cavities. It covers the operation and resonance conditions of short-circuited half-wave lines, open-circuited half-wave lines, quarter-wave lines, rectangular cavities operating in the TE10 mode, and circular waveguide cavities supporting both TE and TM modes. Examples are provided for calculating the unloaded quality factor of different resonator modes.