Options for non EU graduates after residence permit expires

Hi,
I am completing my masters here in Denmark next June. My residence permit is valid until next December. What options I have if I want to extend my residence permit?I want to stay here and find a job. If I coudn't find a job until next December what else I can do?I heard about establishment visa,but don't know what it is. Does anyone has experience on this situation?

https://www.nyidanmark.dk/en-GB/You-wan … -education

/Nellie

i want to go to denmark
please help me