Answer: learning how to live life
Explanation: The connotation of the word "journey" in this context is a metaphor for the process of learning and growing as a person. The phrase "lifelong" also supports this connotation that the journey refers to the process of learning how to live life through experiences, lessons, and personal growth. The other options such as "following the same beliefs" implies to stick to a certain ideology, "overcoming obstacles" means facing and triumphing over difficult challenges, "walking to town" refers to a physical journey to a destination.