Here are two useful resources that I would recommend checking out if you are interested in finding out more on Nutanix. These are the Nutanix education channel ‘nu.school’ and the Nutanix Bible.
The nu.school channel post video training pretty regularly and especially when Nutanix release a new version of AOS. I would recommend subscribing and checking out the new videos when they are uploaded. You can find the nu.school channel here
If you are looking for the inner working of Nutanix should really check out the Nutanix Bible.It has been put together by Steven Poitras who is an Principle Solutions Architect at Nutanix.
The Nutanix Bible can be found here
Information on the Training & Certification available from Nutanix can be found here