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Here are some links to websites with free information on Arabic, and also media sources with free content that can help you practice Arabic.
• Baheth : classical Arabic dictionaries لسان العرب Lisān al-ʿarab (The tongue of the Arabs) by Ibn Manzūr (XIIIe) (or scanned book) القاموس المحيط Al-qāmūs al-muḥīṭ (The surrounding ocean) by al-Firuzabadi (XIVe)
In Arabic, there is a very useful expression that can be used to express possibility or necessity, etc. of a certain action. This expression is made up of the preposition (من), followed by a definite adjective, and then (أن) and a present tense verb in the subjunctive. من اللازم أن