If you build extremely complex files in Adobe Illustrator, you’re most likely smart enough to build your files carefully using the layers feature. Building your file using layers not only helps you stay organized, but it makes it so much easier to edit your files later. It’s not out of the ordinary for me to have 5 to 10 different layers in an Illustrator file, so this tip comes in very handy. To select all the objects on any layer, simply Option + Click on the layer name (not the layer icon) in the Layers panel.