The story of publishing papers in journals is twofold; before and after Covid-19. I have this classification because when I compare the APCs of journals before and after Covid-19, I see that there is a big increment. But, there is another option, submitting the paper to the special issues with very low APCs. Right here I have these questions. What is the difference between publishing papers on special issues and regular issues? What are the advantages of getting published in the special issues? What is the reliability of getting published in the special issues?