PS C:\Users\vinith> Get-NaHelp | select category -Unique
Category
--------
aggr
cifs
toolkit
fpolicy
host
igroup
iscsi
license
lun
net
nfs
portset
quota
radius
snapvault
snmp
clone
disk
fcp
options
vfiler
nameservice
cf
copyoffload
fc
ndmp
priority
reallocate
sis
snapmirror
rsh
storage adapter
useradmin
feature
file
flash
lock
perf
qtree
ses
snaplock
snapshot
system
clock
volume
vss
secureadmin
ems
wafl
consistency group
Then later explore the set of cmdlets in each category one by one, for example you can see below that below i can see all the cmdlets which belong to the category type Aggregate
PS C:\Users\vinith> Get-NaHelp -Category aggr
Name Category Api
---- -------- ---
Add-NaAggr aggr {aggr-add}
Confirm-NaAggrSpareLow aggr {aggr-check-spare-low}
Get-NaAggr aggr {aggr-list-info}
Get-NaAggrFilerInfo aggr {aggr-get-filer-info}
Get-NaAggrMediaScrub aggr {aggr-mediascrub-list-info}
Get-NaAggrOption aggr {aggr-options-list-info}
Get-NaAggrScrub aggr {aggr-scrub-list-info}
Get-NaAggrSpace aggr {aggr-space-list-info}
Get-NaAggrVerify aggr {aggr-verify-list-info}
New-NaAggr aggr {aggr-create}
New-NaAggrMirror aggr {aggr-mirror}
Remove-NaAggr aggr {aggr-destroy}
Rename-NaAggr aggr {aggr-rename}
Resume-NaAggrScrub aggr {aggr-scrub-resume}
Resume-NaAggrVerify aggr {aggr-verify-resume}
Set-NaAggr aggr {aggr-online, aggr-offline, aggr-restrict}
Set-NaAggrOption aggr {aggr-set-option}
Set-NaAggrRaidType aggr {aggr-modify-raid-type}
Split-NaAggrMirror aggr {aggr-split}
Start-NaAggrScrub aggr {aggr-scrub-start}
Start-NaAggrVerify aggr {aggr-verify-start}
Stop-NaAggrScrub aggr {aggr-scrub-stop}
Stop-NaAggrVerify aggr {aggr-verify-stop}
Suspend-NaAggrScrub aggr {aggr-scrub-suspend}
Suspend-NaAggrVerify aggr {aggr-verify-suspend}