Examples
Example maps, prefabs and other content for Half-Life: Alyx.
Workshop Examples
These are annotated examples of various Half-Life: Alyx features made by the Alyx dev team. 
They are located in \Steam\steamapps\common\Half-Life Alyx\content\hlvr\maps\workshop_examples  unless otherwise noted. 
Showcase of Hammer Tools
- cables_example.vmap
 - tilemesh_example.vmap
 - hotspot_example.vmap
 - vis_example.vmap
 - postprocessvolume_example.vmap
 
Gameplay Examples
- combine_encounter.vmap
 - blind_zombie_example.vmap
 - hacking_example.vmap
 - vehicles_and_prefabs_example.vmap
 
Sky and lighting presets
- prefabs/environment_settings/environment_afternoon_01.vmap
 - prefabs/environment_settings/environment_afternoon_02.vmap
 - prefabs/environment_settings/environment_day_01.vmap
 - prefabs/environment_settings/environment_night_01.vmap
 - prefabs/environment_settings/environment_overcast_01.vmap
 - prefabs/environment_settings/environment_storm_01.vmap
 - prefabs/environment_settings/environment_sunset_01.vmap
 - prefabs/environment_settings/environment_sunset_02.vmap
 - prefabs/environment_settings/environment_workshop_01.vmap
 
Material examples
The following are located in \Steam\steamapps\common\Half-Life Alyx\content\hlvr\materials\workshop_examples 
- blend/brick_1c_comp_hs_to_dead_xen_example.vmat
 - brick/brick_1c_comp_hs_example.vmat
 - combine/example_combine_monitor_screens.vmat
 - hotspot/example_metal1_hs_color.vmat
 - hotspot/example_wall_plaster1_hs.vmat
 - monitor/screen_russell_desktop_02_example.vmat
 - monitor/screen_russell_desktop_10_example.vmat
 - monitor/screen_russell_desktop_12_example.vmat
 - skybox/skybox_workshop.vmat
 
Full source of released maps
You can check out the full source of all maps and supporting prefabs shipped in the final game here \Steam\steamapps\common\Half-Life Alyx\content\hlvr\maps\release  
You're not expected to recompile the release maps. The full lighting and audio calculations would likely take an excessive amount of time on a home PC - but you'll be able to add content at an entity level using the new Map Extensions feature.