I Get Stronger By Doing Nothing is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Chu Tianshu, who was reborn in another world, finds himself in a wedding ceremony with a princess! In the face of the contemptuous passers-by, the schemes of his in-laws, and the oppression of the strong, Chu Tianshu, who is armed with cheats is destined to cultivate supreme techniques, marry the most beautiful woman, fight powerful foes, and hold the sceptre of life and death! After reaching the top of the world, he was filled with emotion: In this life, I have lived up to the reputation of being a transmigrator!