Archaeology is a very broad subject and within it are a wide range of specialisms, from excavating in the field, geophysical survey, finds interpretation, chemical analysis in laboratories and dating techniques to forensic investigation for the police.
Additionally the period of the past that you are interested can also become your specialist area, whether it’s Prehistory, Roman, Medieval or Industrial archaeology.
So archaeologists enter the profession through a wide variety of routes and courses reflect this broad range of disciplines.