になる details
Examples
become — a change of state into a noun or na-adjective quality
弟、四月から社会人になるんだって。
otouto, shigatsu kara shakaijin ni naru n datte.
Apparently my little brother starts working life in April. casual
夜になると、この通りは急に静かになります。
yoru ni naru to, kono toori wa kyuu ni shizuka ni narimasu.
When night falls, this street suddenly goes quiet. neutral
長女は昨年、弁護士になりました。
choujo wa sakunen, bengoshi ni narimashita.
Our eldest daughter became a lawyer last year. formal
Formation
{N}になるattaches to nounna-adj + になる（静かになる）attaches to na-adjective
Notes
Related patterns
Similar
The same "become" split by word class — nouns and na-adjectives take になる (医者になる、静かになる), i-adjectives take stem+くなる (高くなる); the two never swap hosts, so the choice is grammar, not nuance.
になる states a bare change of state (春になる); ことになる wraps a whole event as an arranged outcome — 転勤することになった says somebody decided it, while 春になった claims nothing about anyone's hand in the change.
Same なる, different scope — になる flips a state (春になる), ようになる shifts what someone habitually does or can do, and only gradually; 話せるようになった marks an arrival after a stretch of change, not a switch.
Lookalikes
The same Nに + verb frame one verb apart — する is a choice by an agent (会議は金曜にする, we'll make it Friday), なる a change that just happens (金曜になる, Friday arrives); swapping them misassigns responsibility for the outcome.