Quick links to some commonly used core API pages:
Map, MapView, and SceneView
Map - WebMap - WebScene - MapView - SceneView - View
Layers
BuildingSceneLayer - CatalogLayer - CSVLayer - DimensionLayer - ElevationLayer - FeatureLayer - GeoJSONLayer - GraphicsLayer - GroupLayer - ImageryLayer - ImageryTileLayer - IntegratedMesh3DTilesLayer - IntegratedMeshLayer - KMLLayer - LineOfSightLayer - MapImageLayer - MapNotesLayer - MediaLayer - OGCFeatureLayer - OpenStreetMapLayer - OrientedImageryLayer - ParquetLayer - PointCloudLayer - RouteLayer - SceneLayer - StreamLayer - SubtypeGroupLayer - TileLayer - VectorTileLayer - VoxelLayer - WCSLayer - WebTileLayer - WFSLayer - WMSLayer - WMTSLayer
Geometries
Circle - Extent - Geometry - Mesh - Multipoint - Point - Polygon - Polyline - SpatialReference
Other commonly used modules
Basemap - config - Graphic - IdentityManager - LabelClass - query - Renderer - request - SimpleMarkerSymbol