The adventure of Huckleberry Finn is a novel written by Mark Twain. He is an anti-slavery person, so he writes about it.
Taking into account the theme of slavery, the author demonstrates slaves life through Jim. He wants the reader to feel sympathy and empathy for Jim who is one of the main characters.
Considering the idea of freedom/liberty, you can mention the theme of slavery and stand out that Jim runs away from his owner, Miss Watson (when he hears that she wants to sell him). So he decides to work to obtain money so he can buy his family's freedom.
At the end of the story you kinda get to the idea that maybe Huck may wanna have some rest now, after all that has happened. This puts the spectator in a clear view of what liberty or freedom means to some and what it means to others. Although, at the end, Huck is just to loyal to himself and decides to go on with the adventures.
We can conclude that freedom is subjective. It depends on what we need.
