There are some mustahab or sunnat etiquettes of fasting which will increase the reward. And if you leave it, the fast will not be broken or it will not be a sin. But there will be a lack of virtue. But when it is realized, the perfection of deed comes. These etiquettes are mentioned below: –
 Eating sahri
The Prophet (peace and blessings of Allaah be upon him) said:
(A) You eat sahri, because sahri is blessed. (Bukhari-1923 and Muslim-1095 (b) The difference between the fast of us (Muslims) and the Jews-Christians is to eat sahri
(B) Dates are the best food in the believer’s sahri. [ Abu Dawood-2345]
(C) (For fasting people) Sahari is a blessed food. So never skip eating sahri. Even if you drink a sip of water, eat sahri. Because Allah and His angels remember the one who eats sahri. [Ahmad-10702]
 Eating Sahri Late
That means it is better to eat it at the last moment. The food taken at the end of the night is called sahri.
 Utilizing the time of sahri in worship
The last third of the night Allah Subhanahu wa Ta’ala descended from the Throne to the first heaven. And he called out to his servants: Narrated Abu Huraira Allah’s Messenger (ﷺ) said, “When it is the last third of the night, our Lord, the Blessed, the Superior, descends every night to the heaven of the world and says, ‘Is there anyone who invokes Me (demand anything from Me), that I may respond to his invocation; Is there anyone who asks Me for something that I may give (it to) him; Is there anyone who asks My forgiveness that I may forgive him?’ “[Bukhari-6321 and Muslim-758]
Therefore, it is a good time to study the Qur’an, recite it, perform the prayers of Tahajjud, repent and ask for forgiveness. Praising them, Allah says: “They wake up on the last night and repent.” [Surah Jariyat-18]
 Iftar as soon as the sun sets
That means breaking the fast early. Do not delay iftar in the name of exaggerated caution. The Prophet (peace and blessings of Allaah be upon him) said:
(A) Narrated Sahl bin Sa`d: Allah’s Messenger (ﷺ) said, “The people will remain on the right path as long as they hasten the breaking of the fast.”(Bukhari-1957 and Muslim-1098) (b) Narrated AbuHurayrah: The Prophet (ﷺ) said: Religion will continue to prevail as long as people hasten to break the fast because the Jews and the Christians delay doing so.[Abu Dawood-2353]
(B) Three things are part of the character of the Prophet: breaking the fast as soon as it is time, eating the last time of sahri and placing the right hand on the left hand in prayer [Tabarani]
(C) The Prophet (peace and blessings of Allaah be upon him) and his Companions used to break their fast early and eat sahri later than everyone else. [Musannaf AH Razzaq]
 Breaking the fast before the Maghrib prayer and breaking the fast with dates or water
Anas (may Allaah be pleased with him) said : The Messenger of Allaah (peace and blessings of Allaah be upon him) used to break his fast with fresh dates before the Maghrib prayer. If fresh dates were not available, he would break his fast with dried dates. And if dried dates were not available, he would break his fast with a few sips of water. [Ahmad]
However, eating on a full stomach does not support Islam. The Prophet (peace and blessings of Allaah be upon him) said: “Whoever eats with a full stomach, that stomach (in the sight of Allaah) is an inferior vessel.” [Tirmidhi]
practice to eat one-third of the food in the stomach, and one-third to drink water. The remaining one-third will be left empty for breathing. [Tirmidhi]
 Praying during Iftar
This moment is the time to be saved from hell. The Prophet (peace and blessings of Allaah be upon him) said :
(A) During Iftar, Allah Almighty saves many people from Hell. And the turn of this liberation continues every night of Ramadan. At that time, the prayers of every fasting person are accepted. ” [Ahmad]
(B) When the Prophet (peace and blessings of Allaah be upon him) used to break his fast, he would say: O Allaah! I have fasted for you, and I am breaking my fast with your sustenance.
It is to be noted that Allama Nasiruddin Albani has described the above hadith as weak.
(C) The Prophet used to recite dua the time of breaking the following: “The thirst is gone, the veins are moistened and the reward is confirmed, if Allah wills.” [Abu Dawood, Darakutni, Baihaqi, Albani call the hadith Hasan]
When the call to prayer is made during Iftar, the time after the call to prayer is the time of accepting dua. There is a hadith that the dua between Azan and Iqamah is accepted.
 Reading the Qur’an more and more, praying, remembrance and supplication
Since Ramadan is the month of the revelation of the Qur’an, the recitation and study of the Qur’an in this month should be done more than any other time.
The Prophet (peace and blessings of Allaah be upon him) said: Fasting and the Qur’an will recommend to people (on the Day of Resurrection) (fasting) in such a way that fasting will say, O Lord! During the day I forbade him to eat and drink and enjoy sex. So accept my recommendation on that. The Qur’an will say, O Lord! (Because of reciting the Qur’an at night) I prevented him from sleeping at night. So accept my recommendation regarding this reader. He said then the recommendation of both will be accepted. [Ahmad-6589]
 To seek the tawfiq of worship and to realize the mercy of Allah
The worship we do is also a mercy of Allah. We thank Him for giving us Tawfiq in this work. Many good deeds are not accepted again. Allaah says (interpretation of the meaning): “Allaah accepts only the deeds of those who guard (against evil). [Maidah: 27]
Let us worship with fear and hope. Pride and jealousy destroy the worship of a servant, and if he disbelieves and associates others with Allah, none of his good deeds will reach Allah, but the worships will be destroyed and annulled.
 Sympathize with orphans, widows, and the poor, and give generously.
Give them Zakat, Fitra and Sadaqah. It is narrated in the hadith : The Prophet (peace and blessings of Allaah be upon him) was the most generous of people, and his generosity would have increased in Ramadaan. [Muslim-230]
 Practicing good character building
Ramadan is a month of patience. So at this time, we have to practice building a beautiful character. The Prophet (peace and blessings of Allaah be upon him) said: If any of you fasts, let him abstain from obscenities and noise. If someone comes to abuse and fight with him while he is fasting, let him say, “I am fasting.” [Muslim-1151]
 Refrain from wastage and wasteful spending
Many people waste their time on food, clothing and comfort. It is an abomination. Refrain from this.
 Utilizing time routinely
Avoid unnecessary talk, gossip, gossip, useless arguments. Routinely plan based work. This will make life more fruitful.
 Reducing worldly busyness
In this blessed month of Ramadan, reduce your worldly life business. The world is temporary and the Hereafter is eternal. Allah says: “even though the Hereafter is far better and more lasting.” [Surah Al-A’la-17]
 Balancing eating and sleeping
Some people eat so much that breakfast and lunch only make up for it once in a while. Again, he makes up for it by sleeping twice a day during Tarabeeh and Sehri. How did the sacrifice of food and sleep? Therefore, the fasting person should abstain from fasting in this regard and should observe fasting while maintaining a balance between the two.
[ 15 ] Giving thanks for God’s blessings
Praise the Lord for giving tawfiq to worship on the holy days and nights of Ramadan.