Learn Hardcore Russian: Изменение приносит радость.

Изменение is a noun. It’s an abstract noun formed from the verb изменить (to change) by adding the suffix -ние, which turns verbs into nouns indicating an action or result.

Why is Изменение in the nominative case?

In this sentence it functions as the subject. Russian subjects normally appear in the nominative case. Since Изменение performs the action “brings,” it stands in nominative.

What is the role and case of радость?

Радость is in the accusative case as the direct object of the verb приносит (“brings”). For inanimate feminine nouns, accusative looks the same as nominative (both end in -ь here).

Why is the verb приносит in the 3rd person singular present tense and imperfective aspect?

Person and number: The subject Изменение is singular, 3rd person, so the verb is приносит (not приносят).
Aspect: Приносить is imperfective, used here to state a general truth or habitual fact (“change brings joy” as a constant). A perfective form (принести) would focus on one completed instance (“to have brought joy”).