You'll have to gather information and use your judgment to decide whether or not you'll trust a website. Some professors will not accept any non-library website for their research assignments, while others will - but those who will accept websites will probably want you to be ready to explain why you believe the websites you've used are credible (believable, trustworthy).
Questions to ask about every website you find:
Notice that using Google is not a shortcut. To do strong research, you have to do more work, to vet and assess each source to see if you should take it seriously.
There is a lot of good information available on the open web, but every website must be critically considered. This is especially important if you're new to a subject as you'll have to take the time to investigate the authors behind each site to weigh its trustworthiness.
You can exclude results by putting a minus sign in front of words you don't want to be included in your search. This is especially useful when:
Remember, Google will return results about NYC city councils when you are using Google from the New York City area.
Google now automatically searches not only for your keywords, but also any other words that it thinks are reasonable synonyms or related terms.
Sometimes, however, you may want to search just for your exact words. This is especially important if you see an important difference in meaning between your word and a synonym that Google has inserted into your results.
Google does not automatically put the newest results first. Some reasons you may want to limit dates:
Possible uses for a custom range of dates could include:
Many websites, even good ones, have less-than-excellent ways to search within their webpages. Google tends to do a better job searching within websites than other services.
To search within a particular website, type site:[site URL] without spaces then add a single space before typing in your keywords.