Kitap okumadıkça yeni şeyler öğrenmiyorum.

-dıkça is a temporal/provisional suffix added to the verb stem that can mean “as long as,” “whenever,” or, when combined with negation, “unless.”
Breakdown of okumadıkça:

• oku‑ (to read)
• ‑ma‑ (negative)
• ‑dıkça (as long as/unless)
  So okumadıkça literally means “as long as I don’t read” or “unless I read.”

Both can express a condition, but their nuances differ:

• okumazsam = “if I don’t read” (a single conditional event)
• okumadıkça = “as long as I don’t read” / “unless I read” (a repeated or general condition over time)
  Here, okumadıkça emphasizes a habitual rule: whenever you fail to read, you fail to learn new things.

In Turkish, when you speak about an indefinite or generic object, you typically omit the accusative suffix. Also, when a verb is negated, the object usually remains unmarked (no ‑ı/‑i).

• kitap = “a book” (generic/indefinite)
  Thus kitap okumadıkça means “unless I read books,” with kitap left unmarked.

Same rule as above: negative verbs don’t take the accusative on indefinite (generic) objects.

• yeni şeyler = “new things” (in general, indefinite)
  If you meant “I don’t learn those specific new things,” you could say yeni şeyleri öğrenmiyorum, but here it’s a general statement.

Turkish is a pro-drop language. The subject “I” is built into the verb ending ‑(y)orum in öğrenmiyorum. Adding ben is grammatically correct but redundant unless you want to emphasize “I”:

• (Ben) kitap okumadıkça… (with emphasis)
• Kitap okumadıkça… (normal)

öğrenmiyorum is the present continuous negative form of öğrenmek (to learn). In general statements like this, it conveys a habitual or ongoing lack of learning:

• öğren‑ (root)
• ‑me‑ (negative)
• ‑yor‑ (continuous)
• ‑um (1st person singular)
  So öğrenmiyorum = “I am not learning” / “I don’t learn” (habitual).

You could say Kitap okumadan yeni şeyler öğrenmiyorum, meaning “I don’t learn new things without reading books.”
Differences:

• ‑madan = “without doing X” (simple, “if/when X doesn’t happen”)
• ‑madıkça = “as long as/unless X happens” (emphasizes an ongoing, repeated condition)
  Use ‑madan for a straightforward “without” and ‑madıkça when you want the sense of “unless you do it every time.”

Common translations include:

• “I don’t learn new things unless I read books.”
• “As long as I don’t read books, I don’t learn anything new.”