Learn Turkish: Kitap uzun, ayrıca zor. - The book is long, moreover it is hard.

Ayrıca doesn't show a cause-and-effect relationship. Instead of saying the book is hard because it is long, ayrıca just piles on another point: it is long, and moreover (or in addition), it is hard. It is a very common conjunction for stacking up descriptions.

Where does the word ayrıca come from?

It is built from the adjective ayrı, meaning "separate" or "apart," plus the adverbial suffix -ca. So it literally translates to something like "separately" or "additionally."

There is no verb in this sentence! How does it mean "it is hard"?

In Turkish, present-tense "to be" statements for the third person (he/she/it) often don't need a verb or suffix at all. Simply placing the adjective zor (hard) at the end of the sentence automatically carries the meaning "it is hard." You could technically say zordur, but leaving the ending bare is the standard way to say this in everyday speech.

Could I put ve (and) before ayrıca, like "Kitap uzun ve ayrıca zor"?

Yes, you absolutely can! Saying ve ayrıca translates to "and also" or "and moreover." However, just using a comma followed by ayrıca is perfectly natural and slightly more concise when listing traits about the same subject.