I did a fresh install of SharePoint 2016
When I click on the help button I see this error:
Unfortunately, help seems to be broken... There aren't any help collections in the current language for the site you're using.
I have run and re-run the SharePoint Products Configuration Wizard multiple time to no effect.
As per this doc I tried using
Hcinstal.exe /act InstallAllHCs but Hcinstal.exe doesn't seem to exist on sharepoint 2016
I also tried this, but it seemed to do nothing (completed without error though)
Add-PSSnapin "Microsoft.SharePoint.PowerShell Install-SPHelpCollection -All