If you're anything like most people, you've perhaps launched one or two Max For Live devices - assuming you own it - its an add-on to regular Live 9 and included in Live 9 Suite. But thats probably about it, unless of course you've dug in and explored - in which case - good work.
However unless you've done a Max For Live module as part of a music production course, your knowledge of it may be zero. Max For Live developer Desert Sound Studios have produced a free getting started guide, designed as an introduction.
Download it from http://dsrtsound.com/m4l-getting-started-guide/
It covers -
Eurorack module puts General MIDI sound set under creative CV control