Day Questions

What is the method to determine the best time for Fajr (Morning) Prayer?

It is best to perform the Fajr prayer immediately after the break of dawn.

Does chewing gum while fasting invalidate the fast?

Chewing gum does not invalidate the fast as long as parts of it, including soluble parts such as sugar, do not pass the throat.

Is it sufficient to wipe my head with one finger during wudhu?

Yes, doing so is sufficient in the correctness of the wudhu.