Not all information on the internet is the same quality!
It can be hard to tell what you should or shouldn't trust.
One thing you can check is the currency, or publication date, of a source. You wouldn't drink milk that's past its best-before date, so why trust sources that might be outdated?
Sources with recent publication dates found on well maintained and up-to-date websites are more likely to be reliable sources.
How To Assess A Source For Currency
publication date — when the source appeared online
last update — when the page or source was updated
revisions — when changes were made
the age of the information
if the information is the most recent available
how the dates match the information you're reading — for example, Shakespeare's writings will be much older than a news article
Where You Can Find Dates On A Source
at the top of the page
at the bottom of the page
near the author's name
on a title page or headers/footers on a long document
Signs A Source May Not Be Current
the source is older, especially more than 5 years old
other sources cited within your source are old or out-of-date
the dates on the source don't match the material (the date is too old or too new for what you're reading)
the site isn't maintained or has many broken links
You're working on an essay about an event that happened in 1990. Your essay must answer whether perspectives have changed on the event since then. Which article is the most likely to be the best source based on currency?