what does “With wich” means
I don’t know what context you saw it in, but I’ll give you an example.
“This is the pen with which I write all my important notes.”
So you use it to refer back to a noun that you previously mentioned (in this case, the pen).
I have always found it to be a bit of an awkward phrase and I don’t think I use it unless I’m ‘stuck’ mid-sentence and ‘need’ it to get out of trouble. For example, the above sentence could also be written:
“I use this pen to write all my important notes.”
I find this way much cleaner and better.
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tank you so much my friend jungleboy 
Thansk, this detailed post was very useful