Hello everyone, I am quite new to 3D printing and I have printed some things before I got this problem. At first my extruder started making clicking noises so I was advised by the Internet to loosen one of the screws on it. It worked fine but then I saw that my filament was grinding on the extruder. My next print was a total disaster since the printed lines had a gap between them. I tried cleaning the bowden tube, leveling the bed, loosening and tighting the screws of the extruder but now it seems that the extruder can't push or pull the filament to and from the nozzle. Any ideas of what went wrong??

P.S. sorry for my poor vocabulary, it's my first time posting a question that has to do with printers and English is not my mother language.