Here is a list of all topics with brief descriptions:

Library initialization/deinitialization	This page details how to initialize and deinitialize libusb
Device handling and enumeration	The functionality documented below is designed to help with the following operations:
Miscellaneous
USB descriptors	This page details how to examine the various standard USB descriptors for detected devices
Device hotplug event notification	This page details how to use the libusb hotplug interface, where available
Asynchronous device I/O	This page details libusb's asynchronous (non-blocking) API for USB device I/O
Polling and timing	This page documents libusb's functions for polling events and timing
Synchronous device I/O	This page documents libusb's synchronous (blocking) API for USB device I/O