LibreOffice - unlike Microsoft Word - does not offer to change the color of Arabic diacritical marks (tashkeel/harakat). However, there are two tricks.
Arabic keyboards lack many important special characters. Here is a list of the most important characters and signs which you can copy and paste.
The Arabic broken plural has the effect that scholars still debate how to properly classify the several branches of Semitic languages.
The correct vowel endings damma, kasra, fatha in Arabic can be a headache. If you are careless, you could turn verse 9:3 of the Qur'an into blasphemy (kufr).
Before the Aleph or on top of it - the position of the Tanween fatha has long been debated. Egyptians and Syrians have different approaches
A final Aleph (ألف) in Arabic to express the accusative case (منصوب) can be tricky. Where do you put it on a final Hamza (همزة)? Here are the rules.
The letter Nun can be used to convey emphasis (energetic). There is a "light" and a "strong" form. Here is how it works.