Intellij IDEA 2020.3 Setup

I have used ASCII complaint symbols which, represent some things visually.

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To start go to the code page and click ↓ Download and select any of the options you are comfortable with. Firstly, you want to open the folder you downloaded the source in then open it in Intellij IDEA 2020.3. In the bottom-left corner, you will see a popup saying (i) Gradle projects need to be imported. Click Import Changes. Now after 13-30 minutes, it will say that it is successful. On the right-side, you will see a tab called ⪮ Gradle, Open it and click ⪮ and then Go to Tasks/fg_runs/genIntellijRuns/ click on it and wait. On the top-right, you will see a few buttons. Go to the dropdown menu and select ▢ runClient. Click ▶. After a few minutes Minecraft will appear on your taskbar. Go into Mods or Mod Settings. You will find OpenBlocks there and now you can edit the mod and use the changes.