Learn Arabic (Modern Standard): قرأت الخبر لأن الموقع ممتع. - I read the news because the website is interesting.

The word لأن means "because". A key rule in Arabic is that لأن must be followed immediately by a noun or an attached pronoun, never a verb. Here, it is correctly followed right away by the noun الموقع (the website). It sets up a small "noun sentence" right after it to explain the reason.

"The news" looks plural in English. Is الخبر singular or plural?

الخبر is singular! It literally translates to "the piece of news" or "the report". While English uses the plural-looking word "news" even for a single concept, Arabic has both the singular الخبر and the plural الأخبار. You will often see both translated simply as "the news" in English.

How does the word قرأت show that I am the one who read the news?

In Arabic past tense verbs, the person who did the action is shown by a suffix at the very end of the word. The base word for "he read" is قرأ. By adding the suffix ـت (pronounced "tu") to the end, it becomes قرأت (I read).

Where is the word for "is" in the phrase "the website is interesting"?

There is no word for "is" or "are" in present-tense Arabic sentences. The phrase الموقع ممتع literally means "the website interesting." Because الموقع is definite (it has "the") and ممتع is indefinite, they automatically link together to form a complete sentence meaning "the website is interesting."