Gender inequality in curricula means that the things you learn in school or other educational programs are not the same for boys and girls. Sometimes girls might learn things that are not as important or interesting as what boys are learning, or they might not learn about things that are important for girls but not boys. This can happen because the people who design the curriculum or decide what to teach think that boys are better than girls, or that boys and girls should learn different things based on their gender.
For example, in some curricula, girls might not learn about famous women scientists or inventors, and only hear about male ones. This can make girls think that science and technology are activities for boys, and not realize how much women have accomplished in these areas. Similarly, boys might not learn about topics like communication and relationships, because they are seen as "girly" topics. This can lead to boys not realizing how important these skills are in life, and not developing them as well as they could.
Gender inequality in curricula can be harmful because it sends the message that certain groups of people are less important or less capable than others. It can limit people's opportunities and interests, and reinforce harmful stereotypes. It is important to make sure that the things we learn in school and other educational programs are fair and inclusive for everyone, regardless of their gender.