HP printer offline

While printing the necessary documents through HP printer, my HP printer goes offline mode. I am applying printing command to my printing device again, and again, my printing machine is showing offline status. HP printer offline is one of the most difficult problems, which is preventing me to print the documents in the simple ways. Hence, I want to bring back my printing machine from offline to online mode successfully. But I am getting some technical issues in this process. So please anyone can recommend the quick fixes to rectify HP printer offline error