Bié dānxīn, zhè běn shū zhuānmén wèi xiǎobái xiě de.
Don't worry, this book is written specifically for beginners.
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小白 is a friendly, casual internet slang term. Unlike 新手 (xīnshǒu, newcomer/newbie), 小白 specifically implies lack of knowledge rather than just lack of experience. It can be self-deprecating or mildly teasing.