Learn Farsi: وی کتاب‌های ادبی زیادی تالیف کرد.

وی is a formal, written equivalent of او (he/she). You will rarely hear it in spoken Farsi, but it is very common in journalism, biographies, and academic writing. Like او, it does not specify gender.

Why does زیادی (many) come after ادبی (literary) rather than directly modifying the books?

When chaining modifiers in Farsi using the ezafe linking vowel, quantifiers like زیادی (meaning 'a lot of' or 'many' in this context) often attach at the very end of the noun phrase. The structure is literally 'books-of literary-of many'.

Could I just use نوشت instead of تالیف کرد here?

Yes, نوشت (wrote) works grammatically, but تالیف کرد is a more specific and elevated compound verb meaning 'authored' or 'compiled'. It is typically used for books or academic works, which perfectly matches the formal tone set by the pronoun وی.

کتاب‌های ادبی زیادی is the direct object of the verb. Why is there no را after it?

The object marker را is only used for definite direct objects (like 'she authored THE books'). Because she authored 'many literary books' in a general, indefinite sense, را is omitted.