〜向き
Suited to (contrast with 向け)machine translation
FormationNoun (target) + 向き；向きの + noun；向きだ
Noun + 向き means "BY ITSELF suited to that target": この料理は子ども向きだ (this dish suits children — because it isn't spicy), 旅行向きの靴 (shoes good for traveling — because they're light). The suitability comes from the thing's inherent qualities, not from the intent of whoever made it.
That is precisely the dividing line with 向け: 向け = the maker DELIBERATELY made it for that target (子ども向けの本 — a book written specifically for children); 向き = it just happens to suit (この本は子ども向きだ — this book reads well for children, even though the author wrote it for adults). The N3 exam loves making you choose between these two.
向き also keeps its literal meaning "facing a direction": 南向きの部屋 (a south-facing room). Japanese people also often say 向き不向きがある — every task suits some people and not others.
Examples
この料理は辛くないので、子ども向きです。
This dish isn't spicy, so it's well suited to children.
この靴は軽くて、旅行向きです。
These shoes are light and great for traveling.
南向きの部屋は明るくて、人気があります。
South-facing rooms are bright and very popular.