Suhoor is highly recommended and full of blessings, but missing it does not invalidate the fast.
The Prophet ﷺ said: "The du’a of the fasting person at the time of breaking his fast is not rejected." [Ibn Majah]
The Prophet ﷺ described it as a calm night with a gentle, radiant sunrise. [Muslim]
The Prophet ﷺ emphasized hastening to break the fast as soon as Maghrib enters.
If something is swallowed accidentally, it does not break the fast.
One must make up missed fasts before the next Ramadan, but the order is flexible.

