This tutorial shows you how to install Photoshop brushes by downloading brushes, placing files and loading brushes. Here are more free basic tutorials.
1. Download Brushes
Find the brushes that you want on the web and download it. The Adobe Photoshop brushes file will be in a ABR format.
2. Place File
On desktop, Finder > Applications > Adobe Photoshop CC 2015.5 > Presets > Brushes > drag ABR file into the folder.
3. Load Brushes
In Photoshop Tool Bar, select Brush Tool (B) > open the brush preset picker.
Click gear icon.
Select your brushes > click Open. Done!