In the case of 'rendre visite à quelqu'un' you only conjugate the verb 'rendre' and 'visite' doesn't change , so in the passé composé it would be -
J'ai rendu visite à
Tu as rendu visite à
Il/elle/on a rendu visite à
Nous avons rendu visite à
Vous avez rendu visite à
Ils/elles ont rendu visite à
Hope this helps!
The word visite is a noun in that phrase: rendre visite à qqn.
Chris' answer is very helpful. According to Reverso Dictionary in French, it can translate as a verb to visit, or to pay a visit (noun ). -->. https://dictionnaire.reverso.net/francais-anglais/visite/forced
every verb is conjugated. to help with your learning you should pick a few popular verbs, find the conjugated lists online and see their English translations to understand why/how to conjugate. also understand there is pasts tenses, future, present, etc. study the "big four" to understand. just google it.
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