Academic or Scholarly Journal Articles are written by experts, also referred to as "scholars", in the field of study. Sometimes the article is "peer reviewed" by a group of the authors peers who are also experts in the field in order to verify the article's accuracy. The vocabulary and content is usually very technical.
Trade or Professional Journals are written by professionals or practitioners in the field for their colleagues. The language is usually very professional, but easier to read than an academic journal.
Articles in a popular magazines are written for a general, non-expert audience, usually for entertainment, information or persuasion, and are short and easy to read.
To find Journal Articles, you will search database(s) that are relevant to your field of research.
Consider setting up a free research account in frequently used databases for papers and projects. This helps researchers keep track of specific searches and articles. It can also be used to set up automatic updates when new research on a topic is added to the database.
The video below demonstrates setting up an Ebsco account, but many databases contain this option.