VR

Apps (Ports, Stores)

Valem on YouTube - Several "bit-sized" tutorials introducing essential VR concepts in a concise way for Unity and Ocuslus (Rift/Quest). Summary: create a bowling game; hands; grab; teleport; etc.
Unity and Oculus - Getting started guide - This is a great tutorial (takes a couple of minutes). Really, simple and easy to get + VR. Summary: create a floor and four walls. A sphere as player. Add physics to the sphere. Add a bit of easy to understand code to the player. Turn on VR (Edit >> Project Settings >> XR Plugin Management, Edit >> Project Settings >> Player >> XR Settings).
Space Shooter (archived but good) - contains the essentials of building and running a game.
Unity - C# and Shader Tutorials
Unity - Game Development, VFX and C# Blog
Collection of Unity tutorials
Unity game design tutorials
Setup project for HTC Vive and Oculus
Brackeys - Game tutorials, Blender, Godot, Unity, ... (YouTube)
Coursera - Game Design and Development (Unity) by Brian Winn

Blender - Free tool to create 3D models and animations.
Tutorial to Blender - provides all the essentials, well paced and practical.
Quick Tutorial to Blender - provides all the essentials, well paced and practical (up to date).
Libraries on Blender Cloud - images, textures, characters, etc.

Blender Libraries - To create models and animations.
ShapeNet - Database of models with text descriptions.
ShapeTalk - A Language Dataset and Framework for 3D Shape Edits and Deformations.
Probuilder - Similar to Blender but within Unity.
Mixamo – Free characters + animations
Kenney Assets has free assets: 2D, 3D and sound.
Unity's Asset Store - several free and many commercial assets.
Dev Assets mixture of different assets (free and commercial)
Poliigon - Free textures, e.g. for materials.
Turbo Squid 3D models
3D Warehouse 3D models (SketchUp and Collada)
Unsplash, Pexels, Flickr
Standard Assets – simple typical ; tutorial about it https://www.youtube.com/watch?v=UA9JDdl2cFo
Meta Person (easiest way to create an avatar from a picture), Ready Player Me (Avatar creator), Character Creator 4 (commercial, but one of the best)