You may use search engines like Google if you need new and updates information you cannot retrieve from elsewhere. For example research results that have not been published in an academic journal yet. If there is published research about the subject, however, webpages should not be a source of information. Here you will find good advice as to how you can check the quality of internet sources.
Is the source well written? Is the source structured and organized or busy and difficult to follow?
Here you will find an illustrative example of where you can find the different elements of a webpage.