This tutorial covers Conway's game of life in Unity 21019.3.0f3 with entities 0.4.0 preview.10 . Checked against 2019.3.4f1 & Entities 0.7.0 Preview.19 on March 03, 2020. Packages used are shown here
This first tutorial covers a working game of life in Unity DOTS. The source is at https://github.com/ryuuguu/Unity-ECS-Life.git and is commit Tutorial 1f4 on Dec 30, 2019 at 16:36. There is already an excellent tutorial on DOTS made by Unity Getting Started With DOTS: Scripting Pong (Tutorial), that I would recommend …