A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
And when you're done with the basics: http://stormtek.geek.nz/rts_tutorial/index.php https://hyunkell.com/blog/rts-style-unit-selection-in-unity-5/
Enjoyed your video. Neat style to those graphics!