Power system frequency and voltage control are vital for maintaining power grid stability. With the large-scale integration of power electronic converter-interfaced sources into power grids (e.g., wind farms, solar-PV systems, and battery energy storage systems), the conventional frequency and voltage control strategies are rapidly becoming inadequate due to reduced system inertia and strength. Therefore, new strategies should be deployed to maintain frequency and voltage within acceptable levels stipulated in grid codes/ rules, such as by employing grid forming and grid-supporting inverters. This tutorial will cover the power system frequency and voltage control aspects in converter-interfaced renewable-rich power grids, including the modeling and controlling of grid-forming and grid-supporting inverters. Moreover, the tutorial will also shed light on emerging system support services in frequency and voltage control domains.