Learn Farsi: بازیگر جوان بهترین است.

بهترین is an irregular superlative adjective. Just like in English where good changes to better and best, Farsi has an irregular comparative form. The word for better is بهتر. To make it superlative to mean the best, we just add the standard suffix -ین to get بهترین.

I learned that superlative adjectives usually come before the noun. Why is بهترین at the end of this sentence?

You are right that when a superlative is attached directly to a noun, it comes first, like in بهترین بازیگر for the best actor. However, in this sentence, بهترین stands alone after the subject to describe it, linking with the verb است for is. This exactly mirrors the English structure: The young actor is the best.

How are the words بازیگر and جوان linked together in speech to mean the young actor?

They are connected by the invisible ezāfe vowel. In Farsi, when a noun is followed by its describing adjective, they are linked by a short e sound. So بازیگر جوان is spoken as bazigar-e javan. Farsi also has no word for the, so we rely on context to know it means the young actor.

Is there an easy way to remember the vocabulary word بازیگر for actor?

Yes, you can break it down into two helpful parts! بازی means play or game, and گر is a very common suffix used to show a person's profession or someone who does a specific action. Put them together, and a play-doer naturally becomes an actor.