Knowledge vs Art

What is the meaning Knowledge

and in deference side we knew about Art

may be alot of people said

 I have knowledge technician, economics,   technologies, trade etc

 this is normaly, if some said like that

because we didn't know about what is the real knowledge

some of masyaikh moeslem said " the knowledge is all of anything that from the knowledge of Allah Azza Wajalla, throught from  rosulullah SAW  this is real meaning of Knowledge (ILM)

The subjek of knowledge like ; tecnic, economic, arsitectur, electrical,computer etc, actualy is not knowledge, but only Art

Some one  have alot off knowledge about tecnician, that meaning he only know about Art of Technician

Some one  have alot off knowledge about economics, that meaning he only know about Art ofEconomics

Some one he have alot off knowledge about electrical, that meaning he only know about Art of Technician

but whe didnot understand, 

we just say the knowledge is like normaly people says