This Topic contains useful mapping tips & tricks. I will try to add bulk resources to this main post. Replies can be new tips you’ve discovered.
- Valve Developer Wiki (Half-Life: Alyx)
- Valve Developer Wiki (SteamVR)
- Source 2 Hammer introduction by Marnamai.
- Hosomi has a load of short tutorials on specific topics, similar to 3kliksphilip on Source 1.