If you want a place to practice your NSX lab, then VMware HOL is the place for you. After a long wait, the VMware NSX labs are available on VMware Hands-on-labs.
There are 2 Labs for practising NSX
1: HOL-SDC-1303 – VMware NSX Network Virtualization Platform
2: HOL-SDC-1319 – VMware NSX for Multi-Hypervisor Environments