Learn Turkish: Bilgisayar olsun, telefon olsun, yüksek performans her zaman caziptir. - Whether it's a computer or a phone, high performance is always attractive.

Olsun is the third-person imperative form of olmak (to be), literally meaning "let it be." When you repeat it after different items, like bilgisayar olsun, telefon olsun, it creates an inclusive list meaning "let it be a computer, let it be a phone" — which we express in English as "whether it's a computer or a phone."

Do the nouns before 'olsun' need any case endings?

Not in this specific sentence. Because the items (computer, phone) are acting as the subject of the "whether it is" concept, they stay in their bare, dictionary form (bilgisayar, telefon). You simply place the bare noun right before olsun.

Why is the '-tir' suffix added to 'caziptir' at the end?

The -tir (a variation of the -dir suffix) is used here to state a general, objective fact. Because "high performance is always attractive" is being presented as a universal rule rather than a temporary or personal observation, adding -tir makes the statement sound definitive and factual.

Could I use 'çekici' instead of 'cazip' for "attractive"?

You could, but cazip is the more natural choice here. While çekici translates to "attractive" or "alluring" (often used for physical appearance or magnetic charm), cazip means "appealing," "tempting," or "advantageous." This makes cazip much better suited for describing things like consumer electronics, prices, or job offers.