What is the logic of Plugin "Virtual Aliases"?

Installed it as written. Where and in what sense to put the addresses in order to work correctly. To put TV "Aliases" field "Default Value:", or somewhere else? If you give an example of the now non-existent address http://www.domain.com/ffsdg?21 new http://www.domain.com/other.html. Many thanks in advance.

I recently could not get Virtual Aliases to work either. Tried all different options and it never worked. I ended up using a plugin named missing. Not as user friendly but worked like a breeze.

I tried the other (Мissing), as described in the example but not work. I have installed Seo Strict, and addresses were before SEF. So I asked for this Plugin because people largely praise it and say it works.
Thank you for still views.

I doubt if the said plugin handles Query Strings yet. Though for normal urls it work flawlessly.

Well, work is my mistake. Tell how it works Virtual Aliases?