I Become a Legendary Arch Mage by Reading a Book is a Manga/Manhwa/Manhua in english language, Adventure 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

I was reincarnated as a grimoire with all the magical knowledge of this world. Anyone can become a legendary arch-mage with my help. Read me and I’ll give you endless power.