There is also a technique for boiling eggs. If you want the resulting boiled eggs not to crack and smooth after peeling, use lots of water in boiling the eggs. There is a lot of water here, the water soaks all the shelled parts of the egg.
Also add a little cooking oil to the boiled egg water. Boil the eggs until completely cooked for about 30 minutes. Place the eggs in the pot while the water is still cold. Simmer slowly over low heat for impressive poached eggs.