you may have a dead battery of a shorted wire or component. be sure to connect positive to positive and negative to negative. disconnect one component at a time to find short.
check that the exaust manifold isn't touching the starter
have you checked the cables to see if they are corroided, loose, or broken If your battery is good then it is your starter you will need to replace it.
The wires to the starter are probably connected wrong.
Have you checked the starter? Check cables to starter or jumping solenoid to see if it will turn over. If you have to, remove the starter and get a battery with a set of booster cables, put the starter in a vise gently and try it with booster cables directly to see if it works. If it doesn't work at that point You've already got it out so go get a rebuild or new one and put it in.
Ignition switch, battery, battery cables, starter relay, starter solnoid, starter, flywheel ring gear.
it could be the starter or it could just be a bad battery, try to jump start the vehicle with another vehicle with jumper cables or a jumpbox, if the vehicle starts, most likely it is the battery. It is still a good idea to get the starter checked out.
On the starter or IF you have (2) positive battery cables, in between them.
is the battery fully charged?
Seized engine? Loose or corroded battery cables? Weak or dead battery? Bad starter solenoid? Bad starter? Bad clutch or neutral safety switch? Bad ignition switch?
Check the battery cables or starter.
Bad connectins at battery? Clean connections. Possible loose battery cables on starter or engine block? Clean and tighten cables. If no help, possible bad battery cable/cables. Test cables and replace as necessary. Depending on what type of car, also investigate starter cylinoid. Hope that helps.
dead battery bad starter solenoid bad starter loose or corroded battery or starter cables
Dead battery, corroded or loose battery or starter cables, defective starter or starter solenoid, loose ground connection.