The Galactic Colonization Handbook

"Mr. Lu Yang, may I ask how ordinary interstellar travelers can be as successful as you?"

"Here are a few books I wrote, you can study them, such as: "Principles of Indigenous Sociology", "Research on the Economics of the Holy Empire", "The Beginning and End of the Third Lingshi Financial Crisis", "The Balassa-Samuelson Effect in Galactic Trade", "Evolution of Social Forms in the High-Martial Arts World", "Investigation of Ethics in the Virtual World"..."

"But Mr. Lu Yang, most people who travel through time have little education."

"Then you can just read this "Handbook of Galactic Colonization"!"

"Is there any way to succeed without reading?"

"Then you can only try to find a galactic noble as your wife!"

This is a hard science fiction novel that has been researched to the extreme, gospel for rationalists

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Lu Yang discovers an alien artifact which allows him to teleport between worlds.