Bonjour Chris !
All the (+être) verbs are covered in our system in two lessons: this one (for 'rogue' verbs) and the "coming and going verbs" lesson (see https://french.kwiziq.com/revision/grammar/conjugate-coming-and-going-verbs-etre-in-le-passe-compose-conversational-past).
Also remember that all reflexive verbs also take être in Le Passé Composé: https://french.kwiziq.com/revision/grammar/conjugate-reflexive-verbs-in-the-passe-compose-conversational-past
À bientôt !
"Décéder" caught me by surprise too. It's logical, though, when you consider that "mourir," an être verb, and "décéder" both mean "to die."
"Devenir" is just as easy to remember. "Venir" is a classic "movement" verb that takes être as the ancillary verb in the passé composé. But you already knew that. "Devenir" is simply a derivative of venir and is conjugated in the same way.
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