If the quality of your source is low or questionable, it's time to find better coverage.
This involves searching for other, more reliable sources whenever you need to verify a claim or information.
The first video [1:34] introduces the concept of finding better coverage, while the second video [4:28] explains this process in more detail:
Note: This SIFT method guide was adapted from Michael Caulfield's "Check, Please!" course at http://lessons.checkplease.cc. The text and media is (for the most part) CC-BY, and free for reuse and revision. The authors ask that people copying this course leave this note intact, so that students and instructors can find their way back to the original (periodically updated) version if necessary.
The SIFT LibGuide at https://guides.lib.wayne.edu/sift (Wayne State University Library System), and the OER book Introduction to College Research (Butler, et al.) were also adapted in the creation of this guide.