I collected a lot of information on the internet and published it after finishing it into a book. Whose copyright is it? Is it infringement?

Hello! If you meet the requirements of assembling works stipulated in the copyright law in the process of finishing, then the assembly right is yours and the copyright of the works belongs to others. In order to reduce copyright disputes after the completion of this book, it is suggested that you give the author's name and source as much as possible for the works you use, and pay appropriate remuneration for the works you use (which can be explained in the book). If you can't pay the remuneration because you can't find the author, you can use the remuneration collection and payment agency to handle it on your behalf. If some works or knowledge have no authors and belong to the public domain, then there is no need to do so as above.