Ordinary People in All the Worlds

My name is Wang Xuan, I am an ordinary person, but fortunately, I have gained the ability to travel across all realms, and the source of this ability is a system. What are the everlasting skills, the sky-shielding method, etc. I actually don't want to learn these skills, but I have no choice but to protect my younger brother, so I learned them because I had no choice. Hey, I just want to be an ordinary person. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.