How to ..., how to ..., how to ...

[rost]

How to limit download speed for one user (ip).
How to find manual or "howto" or any examples, don't understand how to use "Traffic Shaper"
How to find (create) Traffic Class, how to find (create) Traffic Policy, don't understand how attaching a Traffic Policy to an Interface
How to totall disable dragndrop on webgui (he's just disgusting)
There is a command line in opnsense like in vyos?

try create Limiter
Fatal error: Call to a member function children() on null in /usr/local/opnsense/mvc/app/library/OPNsense/Core/Config.php on line 100