Start at the engine, there are one per side at the firewall to one valve cover bolt, one per side at the center subframe mounting, right next to the starter under the heater bos, strap goes from the firewall to the subframe, and the wire from the neg battery cable to the fender.
I put one from the engine block to the top idler bolt.
You also might check/clean the battery clamps and posts on both ends of the cable(s).
You say "nothing happens", Need to be more specific;
1. Turn key and nothing? - Good connections will help, Lights come on? Do they dim when attempt to start? - Check junction block next to battery for cleanliness and the horn relay has a buss bar, make sure it's clean. and the associated wires. Finally, is ign switch good? Take screwdriver and short across bat cable and solenoid terminal to see if starter works.
2. Turn key and a clunk but no starter turn over? - Good connections will help. Probably the solenoid needs replacement, or torn apart and the copper screws rotated 180 deg and all reassembled. Could also be starter needs new brushes and armature needs turning.
3. Turn key and a clunk and a low squeal from the starter - Starter trying to turn, but not enough juice(current). - Good connections will help. Battery in low state of charge and/or cables too small of gauge(wire size).
these are just some of the many possibilities it could be, I'm sure others here can suggest more, be methodical and think about what you're doing, you'll find it.