This last week I attended the Nutanix NTX bootcamp. It is a free course run by Nutanix NTX qualified architects. It is a hard week but there is a great sense of acheivement when completing it.
I would highly recommend registering for the course if you get the chance. They are being run all over the world. Details of the bootcamps can be found here.
More information on the NTX and all the other Nutanix certifications can be found here