Then you can use it any time, even if you are not on line. Many pages do not exist permanently, and useful pages may disappear. Watching out for the same sites Since it is very easy to link WWW sites, many sites on related subjects link to the same sites. That means that you may access the same site from more than one page. Checking the date a page was updated You need to check to see if there is an indication of how recently a page was updated.
Many pages have a note that indicates when it was last updated.
Sometimes a page is put on the WWW and not changed for a long time, so the information might be out of date, so in some cases, it is important to pay attention to this note. For Advanced Users Making your own html file is very easy and useful. You can make a file with any word processor, but you need to handle it as a text only file. You can show your own documents on the web to the students in your class as well as to people all over the world. You can accumulate teaching materials for your classes, and make a library of your publications for your research.