Highlight, take notes, and otherwise mark up articles from quality sources. Whenever you quote or paraphrase any content, be sure to give credit to the authors.
References page example - the above source in APA style:
Axelerad, A. D., Muja, L. F., Stroe, A. Z., Zlotea, L. A., Sirbu, C. A., Docu Axelerad, S., Jianu, D. C., Frecus, C. E., & Mihai, C. M. (2022). Impact of SARS-CoV-2 Infection in Patients with Neurological Pathology. Diagnostics (2075-4418), 12(2), 473. https://doi.org/10.3390/diagnostics12020473
If you are looking for the specific type of article known as a case study, one easy way of finding the most useful articles is to include "case study" as one of your search terms. Note: this example limited the search to articles in which "case study" is the subject, for greater accuracy.