I second this statement but I'll go ahead and give an answer to DJ's question. I can't pick only one for each category so I'll list just a few go to techniques that I like.
Punch: Straight punches for sure. Boxing jabs are fine as well as left hook and right cross.
Kick: Front snap, front thrust (more with the heal). I'm more of a blitzing off of 45's to straight line inside fighter so I mainly use kicks to create distance so I can reset and reestablish a bridge again to get back inside.
Throw: Hip toss and arm drag. Tomoe nage for the big guys who like to lean in.
Lock: Arm bars both standing and from the ground as well as center locks. Finger locks when you can grab them or have to peal a hand off of you.
...and then the rest of the tool box depending on the situation.