Why wont my Car start?

first guess is that your cables from the battery,(red goes to your starter,black goes to your cars body or engine body),your cables are not getting a good connection somewhere.second guess,your starter relay switch(usually located in plastic box under your hood,that flips open and describes each relay and fuse purpose)your relay might be bad.third guess is that your starter has gone out.it is also possible that you clutch safety switch has gone bad(located above your clutch pedal inside,your clutch will push and release this when it is pressed.this switch will not let you crank your car if it is bad.hope this is a simple description