Here are two sentences, the first with a Transitive Verb, the second with an Intransitive Verb:
She held her breath.
She laughed.
This illustrates at a glance the basic difference between the two types of verbs‏‎.
Transitive Verbs
Quite simply transitive verbs must take an object‏‎. We can say:
She held the puppy.
She held his hand.
She held the door open.
But we cannot say:
* She…