Today we will learn how to talk about countries and nationalities. Look at the table below. You can see flags and names of the countries on the left. On the right you can see how to form names of nationalities for men, women and people meaning in plural. As you can see for a man we need to add the ending -(н)ец to the name of his country, for naming a woman we need to add the ending -(н)ка to the name of her country. And for people in plural we need to add the ending -(н)цы to the name of their country.
But some names of nationalities are formed differently. So you need just to learn them.
So now, I hope, you are able to tell more about yourself in Russian. Try to make sentences like that:
Привет! Меня зовут Ирина. Я русская.