Set bookmarks to sites which are of interest, so that you can return to them. Print out or save to your local computer anything that you want on a more permanent basis. There is a lot of information on almost every subject. The information is not organized at all. Unlike the library or the phone book there is no reference manual or complete list of what is out there.
Nothing is permanent.
If you saw it yesterday, that does not mean that it will be there today. There are two basic ways to search the Internet for information 1.1 Select one of the predefined categories which are listed on the page with the search engine. These are only there to help you and are not mandatory starting points. 1.2 Type in a topic of interest to you which may or may not be listed on the page into the engine. Here you can type in any topic on any subject.