to put it in a nutshell	to give the main facts in a short, clear way
to get straight to the point	to talk about the most important thing
to hear it on the grapevine	to hear about smth because the information has passed from one person to another in conversation
to put someone in the picture	to give the latest information (naświetlić sytuację, wdrożyć w temat)
to get the wrong end of the stick	to not understand smth
to be on the same wavelength	to share similar options and ideas (nadawac na tej samej fali)
can't make head nor tail of it	to fail to understand anything
to talk at cross-purposes	to not understand someone
to beat about the bush	to delay talking about smth (owijać w bawełnę)
to get it straight from the horse's mouth	to be told smth by someone who has direct knowledge of it
to be like talking to a brick wall	to try communicate with unresponsive person (gadac jak do ściany)
to keep someone in the loop	to include someone in group comunication, to keep someone informed