What is needed to install Forge?

What is needed to install Forge?
Follow the steps below:

Open the Minecraft Launcher and make sure that the Play button has an arrow beside it.
Go to the Forge download site and select a version for Mac OS.
Select ”Latest” or ”Recommended.
Click the ”Skip” button.
Run the JAR launcher and follow on-screen instructions to install the Forge file.

Follow the steps below:
  1. Open the Minecraft Launcher and make sure that the Play button has an arrow beside it.
  2. Go to the Forge download site and select a version for Mac OS.
  3. Select ”Latest” or ”Recommended.
  4. Click the ”Skip” button.
  5. Run the JAR launcher and follow on-screen instructions to install the Forge file.