Ok so i am tring to apply a script that starts on trigger enter but i want to select only one trigger not all of them and i also what there to be collisions the object with the trigger so the object does not go through things can anyone help me?
You need a collider not set as trigger.
You just write an OnCollisionEnter function.
Lets broaden your vision… Make a game object, give it a collider and make that collider a trigger. Now, make a second object. give it a collider and parent it to the first object. All they then have to do is occupy the same space. Put all your trigger and collision events on the base object, and viola everything works.