This is the 4869th most frequent Arabic word.
الرئيسية
"الرئيسية" means "main" or "homepage" in English, depending on context.
In this sentence, "الرئيسية" is used as an adjective describing the page, meaning the primary or main page.
الصفحة الرئيسية تحتوي على روابط مهمة.
The main page contains important links.
Here, "الرئيسية" qualifies "القضية" (the issue) to specify it as the principal or primary topic.
القضية الرئيسية التي نناقشها هي التعليم.
The main issue we are discussing is education.
"الرئيسية" modifies "الفكرة" (the idea), indicating the principal or central thought conveyed in the article.