Race and sexuality are two things that can describe a person. Just like you may have blonde hair or brown eyes, some people may identify as having a certain race or being a certain sexual orientation.
Race means what group of people you come from based on things like your family history, culture, and physical characteristics like skin color. It's like how some people may be from Italy, and others from China or Nigeria. People can look very different based on their race, but it doesn't affect who they are as a person.
Sexuality is about who you are attracted to romantically or sexually. Some people are attracted to people of the opposite gender, some people are attracted to people of the same gender, and some people are attracted to people of multiple genders.
These things are just part of who someone is, and it's important to respect and accept people no matter what their race or sexuality is. It's like how we may have different favorite colors or foods, but we can still all be friends and treat each other kindly.