If you are an author looking to publish your work, it is very important that you evaluate the journal you are looking to publish in. You want your research to be in a reputable journal with a good track record. You likely want your article to go through a thorough peer-review process where experts from your research field have evaluated and vetted your research methodology. You also want others in your field to recognize the validity of your research and to, perhaps, cite it or build upon the foundation you have created. If you publish in a reputable journal, your work is more likely to be recognized for its positive impact on the field.
If you are a researcher, it is very important that you evaluate the literature you are using as the foundational materials for your study. You want any literature you cite to be from a reputable journal with a good track record. Peer reviewed articles that have been vetted for validity and reliability by experts in the field are a more solid foundation to build your research on. If you cite articles from reputable journals, your work is more likely to be recognized for its positive impact on the field.