Scholarly articles/journals - also known as peer-reviewed, these are published articles, written by experts in the field, that have gone through a process of submission, review, editing, and approval. They are found in scholarly journals.
(telltale signs: title, author credentials clearly stated, abstract, presentation and discussion of data, conclusion, future research considerations, list of cited references)
Books/Book chapters - academic books are, in general, long explorations of a given topic, written and compiled by experts, that have gone through a process of editing and revision.
(telltale signs: reputable or University publisher, author credentials and affiliations, focused and in-depth treatment of subject, cited references)
Popular articles/magazines - written for a variety of audiences and purposes (entertainment, education, persuasion, etc), in general they are readable, feature minimal citations, if any, and appear in journals that appeal to a wide audience. They are often well-researched and nuanced, but lack the depth and focus of scholarly articles. Alternatively, they may be superficial analyses of events and issues.
(telltale signs: lack of rigorous data collection and review of past research, "catchy" headlines and graphics, appear in publications with splashy advertising, author credentials not easily found)
Digitally created content - blogs, Twitter, personal websites, basically anything that falls into a "self-published" category of online content. Even with experts in a field, self-published content has most likely not been through a process of editing and review (see literally anyone's Twitter feed), and most experts will cite their sources, which should be scholarly, and which you should use instead.
(telltale signs: web publishing software, personal copyright, "opinions stated are my own" disclaimers, lack of editorial oversight, annoying advertisements)
News outlets - Trusted venues of news can be a never-ending debate, so instead look for news stories that build on previous stories, are verifiable across multiple outlets, avoid sensational headlines and obvious bias, and are transparent regarding fact-checking, corrections, and sources.
(telltale signs: timely stories informed by cited sources and quotations, evidence of multiple points of view, clear reportage of verifiable facts and events, reputation)
"News" outlets - Organizations with limited credibility tend to publish more sensational, "clickbait"-y headlines, unbalanced sources and quotations from individuals with questionable or unrelated expertise, unverifiable stories, and a general lack of editorial standards.
(telltale signs: YELLING HEADLINES, prominent advertisements, noticeable omissions of news, formatting based on ideology/bias, misleading graphics, inappropriate or no citations, not part of news continuum)