https://developers.arcgis.com/javascript/latest/api-reference/esri-renderers-Renderer.html

• SimpleRenderer
• UniqueValueRenderer
• ClassBreaksRenderer
• DotDensityRenderer
• PieChartRenderer
• HeatmapRenderer
• FlowRenderer
• RasterColormapRenderer
• VectorFieldRenderer

Note I would leave closely related classes: VisualVariable, smartmapping/renderer, etc for other issue