Judging web sources
Remember that anybody can put things on the net, and that some sources are much better than others. Sometimes the letters at the end of a “url” can give you some idea of what sort of site you are using: .org, .edu, .ac and .gov generally mean that it belongs to a public or educational organization. .com means a company or a private person, and it could contain wrong information.
You should always look carefully at who is behind a website. Wikipedia is a popular source , especially for young people, because it is quick and free of charge. But not everyone agrees about how reliable it is. The word “wiki” means that it is written by its users and not by experts, so it may contain errors. You should cross-check the information you find with other sources. It is better to be safe when writing than sorry later!