Although LinkedIn has been around for almost 2 decades, I started using it personally in 2020.
You can build your resume in LinkedIn, search for jobs, set job alerts, network with people in the same industry or industry that you hope to join, post updates or articles to enhance your professional reputation and communicate directly with other people using the messaging function.
If you are familiar with Facebook, you will not have any issue using LinkedIn. You can check out my LinkedIn here and connect with me.