Basic acts of sunnah while eating:
Eat with your right hand
Do not judge about the food
Say the dua before eating and after eating
Drink water in two or three gulps
Filling the stomach with food
Prophet Muhammad ﷺ said, "O boy! Mention the name of Allah and eat with your right hand,and eat the part of the dish nearer to you". Prophet Muhammad ﷺ said," The son of Adam may fill his stomach with a third of his food, a third of his drink, and a third of his breath".
Dua before eating (in English)
In the name of Allah and with the blessings of Allah I begin.
Dua after eating (in English)
All praise is due to Allah who have given us food and drinks, and ordained us as Muslims
Musilms should say this everytime when they are trying to eat and when they are finishing eating but if you forget to say بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ , then say "In the name of Allah at the beginning and at the end".
ٱلْيَوْمَ أُحِلَّ لَكُمُ ٱلطَّيِّبَـٰتُ ۖ وَطَعَامُ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَـٰبَ حِلٌّۭ لَّكُمْ وَطَعَامُكُمْ حِلٌّۭ لَّهُمْ ۖ وَٱلْمُحْصَنَـٰتُ مِنَ ٱلْمُؤْمِنَـٰتِ وَٱلْمُحْصَنَـٰتُ مِنَ ٱلَّذِينَ أُوتُوا۟ ٱلْكِتَـٰبَ مِن قَبْلِكُمْ إِذَآ ءَاتَيْتُمُوهُنَّ أُجُورَهُنَّ مُحْصِنِينَ غَيْرَ مُسَـٰفِحِينَ وَلَا مُتَّخِذِىٓ أَخْدَانٍۢ ۗ وَمَن يَكْفُرْ بِٱلْإِيمَـٰنِ فَقَدْ حَبِطَ عَمَلُهُۥ وَهُوَ فِى ٱلْـَٔاخِرَةِ مِنَ ٱلْخَـٰسِرِينَ ٥
Today all good, pure foods have been made lawful for you. Similarly, the food of the People of the Book1 is permissible for you and yours is permissible for them. And ˹permissible for you in marriage˺ are chaste believing women as well as chaste women of those given the Scripture before you as long as you pay them their dowries in wedlock, neither fornicating nor taking them as mistresses. And whoever rejects the faith, all their good deeds will be void ˹in this life˺ and in the Hereafter they will be among the losers. Holy Quran 5:5