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Input Validation should not be used as the primary method of preventing XSS, SQL Injection and other attacks which are covered in respective cheat sheets but can significantly contribute to reducing their impact if implemented properly.
Input validation should be applied on both syntactical and semantic level.
Keep in mind that even these websites should only be one of many sources of information.
When a high school student using the Internet to do research on the Holocaust concludes that concentration camps were wellness centers for the Jews, something has gone seriously wrong.
Just because you find information at the library does not guarantee that it is accurate or good research.