transitive and intransitive verbs

please tell me how do I know what is transitive verb or intransitive verb
thanks

[HCaulfield]

Transitive verbs normally refer to an action performed by the subject on something or someone else, while intransitive verbs (reflexive verbs) don't.

Transitive:

She advises a friend. (She gives advice to a friend)
I run.

Intransitive:

She advises with a friend (She gets advice from a friend)
I run a report by my boss.

[HCaulfield]

I mixed those up. I run is intransitive and I run a report is transitive... sorry!