The easiest way to explain what is the Golden Ratio is to imagine the line. You have to divide this line into two parts. A - longer and B - shorter. The ratio of A to B is equal to the ratio of A + B, then divided by A.
A/B = (A+B)/A = 1.6180339887498948420…
Let me ask you a question. What is a good design and when you know it? When it has a color scheme harmonious, has good contrast, is readable...? I will tell you. When you feel it. The golden ratio makes your design balanced and beauty. The Greeks based the entire design of the Parthenon on this proportion. Leonardo Da Vinci, Michelangelo, Raphael, Rembrandt and Salvador Dali used it in their projects. So it has to be good.
You don't have to google it in 'Images' every time you want to use it. Then save on your local drive and import to the project. The golden ratio will be in your After Effects forever. With great and helpful controllers. It's fully customizable. You can change the width of the line, color of individual lines and just turn them off. This preset is based on the Shape layer so you can scale it freely. And it's free!
Preset works with Adobe After Effects: CS5, CS5.5, CS6, CC, CC 2014 and CC 2015. Download the Golden Ratio preset ZIP file and unzip it to your local drive. Folder called Bartlomiej Otlowski with a Golden Ratio.ffx file inside copy into the following directory:
Adobe\Adobe After Effects*\Support Files\Presets
Applications/Adobe After Effects*/Presets
*your version of Adobe After Effects
If the Bartlomiej Otlowski folder already exists in the Presets folder then choose the Merge Folder option or just copy the .ffx file into this folder instead.
Restart your After Effects to scan the Presets folder and to add any new presets to the Effects & Presets panel. Twirl down the *Animation Presets menu, and you will find the Bartlomiej Otlowski folder. Open it, and you will find this Golden Ratio preset. Or you can type the beginning of the name in the Effects & Presets panel, and it will show up.