I’ve seen a couple of guides for this that are using outdated versions of stuff, so I decided to throw together an updated version showing you how to install Minecraft Forge for Minecraft 1.11.2. As of today (11th of May 2017), this is the latest version of Mineraft. It is worth pointing out that the install process is the same for older versions of Minecraft. The only difference will come in the form of changes to the UI.
Download & Install Minecraft Forge
The first thing you need to do is download the latest version of Minecraft forge. You can get it from the official website here http://files.minecraftforge.net/, or if you are feeling lazy, click here to download Minecraft Forge.
Check the box to install client and click ok. Let it do it’s thing and when it finishes, load up Minecraft using the Minecraft launcher.
Enable Minecraft Forge
Load up the Minecraft launcher and next to the green “Play” button is an arrow. Click this and it will give you the option to select forge. When you select this, launch the game and it will download some files and dependencies.
One the game loads up, you will see that you can now use mods in Minecraft.
You can now use this mods button on the menu to manage what mods you use while playing the game.
Now that Minecraft forge is setup and installed, you will now be able to start installing mods. This guide will show you how to install Minecraft mods using Minecraft Forge.