Green Open Access, where you share (self-archive) your work in a repository, is one of the original forms of OA. There are a number of advantages to green OA, though there are also some major potential drawbacks.
Piwowar, H., Priem, J., Larivière, V., Alperin, J. P., Matthias, L., Norlander, B., Farley, A., West, J., & Haustein, S. (2018). The state of OA: A large-scale analysis of the prevalence and impact of Open Access articles. PeerJ, 6, e4375. https://doi.org/10.7717/peerj.4375
OpenDOAR is a directory of nearly 6,000 repositories worldwide. If you are not familiar with a repository in your discipline, OpenDOAR is a great place to search.
Digital Commons is the institutional repository for the University of Memphis. Its mission is to collect any product from the work of UofM faculty and staff.