If a person wants to stay 10 days or more in a place, in this case prayers should be performed complete and the person must fast. And if this person wants to stay less than 10 days then prayers should be performed shortened and the person cannot fast. The beginning of 10 days is from the moment of entering the destination, for example from noon of the first day of arrival until noon of the next day is considered as one day.
He should perform the qaḍā of prayers (i.e. perform them again later as compensation) that he has performed completely.
There is no issue with doing this, but if that person doesn’t join the congregation before rukū‘ of the first rak‘at then his/her right is voided.
Such fears and doubts are the insinuations of Satan. Don’t pay attention to that and attend the congregational prayer continuously.
He/She should recite them in a low voice.
It is better to recite tashahhud or other dhikrs while in tajāfi posture.
If other people consider you just then there is no problem for you to be Imam of congregation.
The time of the morning nāfilah starts before the Fajr prayer , f r o m the Fajr adhan until the appearance of redness in the east, and it is possible to perform that immediately after the night prayer.
It is not necessary but it is better to correct their mistake.
Travelers have the right to perform their prayers in al-Masjid al-Harām and al-Masjid al-Nabawi and also all of Mecca and Medina complete or shortened and complete prayer is better and there is no difference between old and new parts of Mecca and Medina.
In that case, they can perform their prayers in any direction.
It is well-known that wearing black clothing for prayer is makrūh and the reason behind it applies to both men and women; but cloak is an exception and it is likely that black Chador is also an exception.