Hey there kiddo, do you know what politics is? It's when people have different ideas about how a country should be run. Some people think that the government should be in charge of everything, while others think the government should only be there to protect people from harm (like if someone tries to hurt them).
Now, a "libertarian democrat" is a person who believes in both freedom and equality. They think that people should be free to do what they want, as long as they're not hurting anyone. This means they believe in individual rights, like the freedom of speech and the right to own guns.
At the same time, they also believe that everyone should be treated the same, no matter who they are. This means they support things like civil rights and helping people who don't have as much as others.
So a libertarian democrat is someone who wants to balance personal freedom with the idea that everyone should have the same opportunities in life. They believe that the government should help protect people from harm, but not control every aspect of people's lives.