Learn Hardcore Arabic (Modern Standard): هل هذا الموعد اليوم أم غدا؟

hal hādhā al-mawʿid(u) al-yawm(a) am ghad(an)?
Notes:
هذا is hādhā (the dh sound is like th in this).
غدًا is ghadan; gh is a voiced “gargly” sound (Arabic غ).
In careful reading, you may hear case endings (-u / -a / -an), but in everyday speech many learners/ speakers reduce or drop them.

What does هل do at the beginning?

هل is a yes/no question particle in MSA. It turns the sentence into a question, similar to putting “Is…?” in English.
Example pattern: هل + جملة خبرية → “Is/Are … ?”

Why is it هذا and not هذه?

هذا is the masculine singular demonstrative this. هذه is feminine singular this.
Here, الموعد (the appointment/meeting time) is grammatically masculine, so you use هذا:

هذا الموعد = this appointment / this time
If the noun were feminine (e.g., هذه الساعة “this hour/clock”), you’d use هذه.