How can one make up a prayer missed due to sleep or travel, and with which prayer should one begin making up, especially if the time for Asr has begun and Dhuhr prayer was missed?

If someone sleeps through the Dhuhr prayer and wakes up at the time of Asr, they must first pray Dhuhr, then pray Asr, while also taking the necessary precautions to wake up, so that negligence does not result in sin. However, if they are traveling a distance that allows for Qasr (shortening prayers), they may combine Dhuhr with Asr as a Jam' Ta'kheer (delaying the first prayer to be performed with the second). Regarding making up missed prayers, some scholars view ترتيب (sequential order) as obligatory, while others do not consider it obligatory.