Faire vs Rendre

In "Verbs: Present 1", you learned about the causative faire, which can indicate that the subject has directed someone to perform an action. Notice that faire is followed by an infinitive here.

• Je le fais réparer. — I am having it fixed.
• Elle lui a fait perdre 5 kilos. — She made him/her/it lose 5 kilos.
• Je leur ai fait faire de l’exercice. — I made them (get some) exercise.

The verb rendre ("to make") can also indicate that the subject has caused something to happen, but it's used with adjectives instead of verbs.

• Elle le rend heureux. — She makes him happy.
• Ça me rend fou ! — That drives me crazy!
• L'erreur a rendu le texte incomprehensible. — The error rendered the text incomprehensible.

https://www.duolingo.com/skill/fr/Verbs:-Infinitive-2