I need video tutorial to learn how to use virtualmin, webmin
Not just installation , I already installed but all aspects or most aspects of these softwares
I found some tutorial videos on Youtube actually… Just search there for “virtualmin”. Question is, how much of Vmin’s considerable complexity can be covered in such a tutorial… I suppose you’ll still have to read manuals and documentation and experiment with it. 
As Dumbledore would put it, “A web hosting panel of this magnitude is not for the faint of heart.” 
Yes I could not find video tutorials to learn more most are basic and going to documentation takes a long time
it takes a long time if you’re 85
learning a trade does take time … if you have trouble with certain features, then there is the forum.
Yes, I agree that you’ll have to invest that time. Web hosting is not something you learn just like that, and it should not be so either, since operating a server also comes with a good deal of responsibility - both towards your clients and to keep the system secure.