Installing brushes to photoshop
www.brusheezy.com/ is probably the best free brush site
Locate a free brush you like and click free download
There will be a timer then a zip file will download
Open your downloads and locate the zip file
Double click on the zip file and it will open a folder with a .abr file or just the .abr file
When the window opens, navigate to the downloads folder and locate the .abr file and select it then select open
Scroll down to the bottom of your brushes and a new folder should be there