I. First of all ENABLE retraction !
What does it mean „retraction" By easy words its sucking back the filament in to the nozzle while extruder is moving from end point of the print to start point of the print. I fit not set up correctly you will see „hairs" on your print. Retraction is important to achieve high quality prints. Retraction can be managed through your slicing software.
Usually default option set up in Cura for example is more than sufficient but of course its depending on filament material your print is made of.