why is not my code working when I try to run it?

Hey there I am trying to develop a website and have some codes that does not work (not because it is wrong written) even tried online guides but no use when I run program in VS or VS code it is useless I want to know what I am doing wrong ? what do I need to run the code and what code files do I need as well. hope u guyz understand what I want :D :D :D