は初心者向き

suitable for beginners

→ は
phrase Rare #41,302
suitable for beginners 初心者向き means that something is designed or suited for beginners. The は marks the topic before 初心者向き.
JA: この説明書は初心者向きです。
EN: This instruction manual is suitable for beginners.

この本は初心者向きである

This book is suitable for beginners.

やさしい英語で書かれているのでこの本は初心者向きである

This book is suitable for beginners because it is written in simple English.

このテキストは初心者向きできている

This text is designed for beginners.

テキストは初心者向きできている

The text is designed for beginners.