Adding Contributed Libraries

The beauty of Arduino platform is that there are libraries available for most peripherals. All you need to do is to Google.
To add a .zip file, Sketch > Include Library > Add .ZIP Library > select the .zip file.
Alternatively (if the library is unzipped), copy the folder to Documents\Arduino\libraries.
After including the library, the path has to be exactly as shown below Documents\Arduino\libraries\<lib_name>\<lib_name>.h/.cpp files.
Restart the Arduino IDE after adding the library.
You can see that the library at Sketch > Include Library.
Many libraries come with example programs, which can be your starting point. The example programs can be found at File > Examples > Examples from contributed libraries.