Q: What do I do if I woke up after the adhan of Fajr and found out it was Ramadan?
A: Fasting is obliged upon everyone with the sighting of the new moon, regardless of the location, or, as a precautionary measure, when atmospheric conditions prevent a potential sighting on the 29th of Shaban.
If a positive sighting is confirmed during the day and you did not make the intention to fast, you are to fast the remainder of the day and make up the day after Ramadan.
Source: Sharh al-Muntaha
Q: Is it permissible to fast on the days of Tashriq especially if it is a day that I normally fast such as a Monday, Thursday, or the "white days" etc.? A: Fasting, be it voluntary or obligatory e.g.
Q: Is it permissible to make up missed days of Ramadan during the 10 days of Dhul-Hijjah or the first 10 days of al-Muharram? What about Ashura, etc.? A: The 10 days of Dhul-Hijjah are days of worship
Q: What is the ruling of fasting the entire month of Sha’ban? A: There are numerous ḥadīth that demonstrate the virtue of abundant fasting in the month of Sha’ban. Fasting the month, in its entirety,