Real Dictionary

have auxiliary verb uses
auxiliary verb: You use the forms have and has with a past participle to form the present perfect tense of verbs.

have in American English
(used with a past participle to form perfect tenses)
to hold in the hand or in control; own; possess
intransitive verb: to be in possession of money or wealth
transitive verb: to possess; own; hold for use; contain

have in British English
verb: to be in material possession of; own

have other verb uses and phrases
If you have something to do, you are responsible for doing it or must do it.
You use have to say that someone or something owns a particular thing, or when you are mentioning one of their qualities or characteristics.

have used with nouns describing actions
You can use have followed by a noun to talk about an action or event, when it would be possible to use the same word as a verb. For example, you can say 'I had a look at the photos' instead of 'I looked at the photos.'