Sources are always written with a given audience in mind. If a source is written for experts, it may be more reputable, but it also may be more difficult for non-experts to understand. On the other hand, sources written for a general audience may be more readable, but less rigorous and nuanced.
While the target audience for a resource may not always be clear cut, knowing the type of resource you are looking for can help you better find those resources. Some search engines will allow you to filter by "scholarly articles" or "trade publications." You can also look at the description of the book or abstract of the article to quickly determine the audience for the source, and whether it might meet your needs.
The type of resource you're looking for will depend on what you're doing with it! If you're looking for curricular resources, best practices, practical strategies and advice, or classroom resources, you'll be more successful if you're browsing popular or professional publications. These include resources like educator blogs, newspapers, magazines, and practitioner journals. Resources like EdWeek or Curriculum Resource Center are great options for these types of resources!
If you're working on a research paper, literary review, data narrative, or other scholarly work, you're going to be looking primarily for scholarly academic literature to support your argument. You'll want to filter your results for peer-reviewed and scholarly work to cite in your paper - you might be able to find useful resources in practitioner journals, but as a general rule you shouldn't be citing popular sources.
Pro:
Con:
Intended Audience: Scholars, researchers, professionals, and university students in particular field
Watch for: "Predatory" or "pay to publish" online journals
Pro:
Con:
Intended Audience: Professional organizations or professionals/scholars with similar interests
What For / Consider: Has characteristics in common with both popular magazines and scholarly journals
Pro:
Con:
Intended Audience: Varies (general audience through scholars)
What For / Consider: Information may be dated due to the time it takes to publish a book.
Pro:
Con:
Intended Audience: General audience or those with a specific, recreational interest (e.g. sports, fashion, science, etc.)
What For / Consider: Potential editorial bias
Pro:
Con:
Intended Audience: General audience
What For / Consider: Contains both fact-based reporting and editorial content (opinions). Opinions may be biased.
Pro:
Con:
Intended Audience: General audience
What For / Consider: Governmental and educational websites have higher credibility than commercial websites
Pro:
Con:
Intended Audience: General audience
What For / Consider: Use the reference list to find other sources that can used
Pro:
Con:
Intended Audience: General audience through scholars depending on the source
What For / Consider: High potential for bias. Usually informal.