What are three factors that could contribute to the credibility
of a source and three that contribute to a source not being credible?

A source is probably credible if
1. it was published in a peer-reviewed scholarly journal
2.The author of the work has a degree such as a PhD
3. The material is fairly new

A source might not be credible if
1. It comes from a personal blog
2. The author of the work seems to contradict themselves and generally seems to not know what they're talking about
3. The material is outdated

The error in the sentence is a dangling modifier

Neither don’t use either