Rule for Conway's life game:

A square has 8 squares around it, number or cells or blue filled square give evolution of cell:

0;1: the cell dies, because of loneliness, square is white
4...8: it dies because of overpopulation.
2: it keeps the current state.
3: a new cell is born, square is filled

To begin, you can choose an example or click on squares to create cells.