Facts represent something that can be known and can be proven to be true or false. Opinions are expressions of belief which may or may not be backed up by facts. Opinions also cannot be proven true or false.
To determine wether you are dealing with facts, ask yourself the following questions:
To determine if you are dealing with opinions:
One approach to source evaluation is called "lateral reading". We would suggest that you give it a try! It involves searching the web for more information about the/a source. You will need to answer the following questions about the/a source and "look at it from the outside" to properly evaluate the source's credibility and whether it's information is fact or opinion.