A commonly used tool for assessing information is the CRAAP test. This allows you to assess sources for reliability and usability. To assess sources, you assign points based on five different criteria by answering questions about the source as you review it. These five criteria are: Currency (validity), Relevance, Authority, Accuracy and Purpose. The total score gives an indication of the quality of the information.
Please note: when assessing the information, take into account the purpose for which you need it!