Unity Tilemap + Grid
In the scene, create an Isometric Tilemap
This will create
Open the Tile Palette:
References
TILEMAPS in Unity (Brackeys)
https://www.youtube.com/watch?v=ryISV_nH8qw
MAKING ISOMETRIC TILEMAPS in Unity 2018 | Beginner’s Guide (Tutorial)
https://www.youtube.com/watch?v=Rh2GQTAX0qo
Authoring 2D Levels with Isometric Tilemap in Unity 2018.3! (Tutorial)
https://www.youtube.com/watch?v=544zgvKnbKc
How to use Isometric Tilemap in Unity 2018.3! (Tutorial)
https://www.youtube.com/watch?v=2DsKCJsEzSA&list=PLX2vGYjWbI0TPcPOKW6GxwuY18eg7CjKZ
https://www.youtube.com/results?search_query=unity+isometric
Authoring 2D Levels with Isometric Tilemap in Unity 2018.3! (Tutorial)
https://www.youtube.com/watch?v=544zgvKnbKc
Creating 2D Player Movement for Isometric Games with Unity 2018.3! (Tutorial)
https://www.youtube.com/watch?v=tywt9tOubEY
2D World Building with the new Isometric & Hexagonal Tilemaps in Unity - Sam Dogantimur
https://www.youtube.com/watch?v=1gqCSRaSv-E
Unity 2D Pathfinding Tutorial
https://www.youtube.com/watch?v=DcJSz5c4VGk
Introduction to Isometric Movement in Games
https://www.youtube.com/watch?v=KvSjJ-kdGio