MPLAB X IDE is built upon the NetBeans platform. Therefore, many of the NetBeans functions are now MPLAB X IDE functions. For more on NetBeans Help topics, see:
https://docs.oracle.com/cd/E50453_01/doc.80/e50452/toc.htm
Help Contents
Please refer to all help files for a complete understanding of MPLAB X IDE behavior. To launch help, select Help>Help Contents. This merges all help files into one, so it may take a little more time to open.
Tool Help Contents
You can also view individual help files for selected tools under Help>Tool Help Contents. Launching an individual help file will be faster and provide a smaller search of topics.
Developer Help
Microchip Developer Help is a good place to look for tips on advanced features:
http://microchipdeveloper.com/
Enter text in the box next to “How do I?” to look up topics in Developer Help.