This is NOT a step by step tutorial guiding you on how to setup and configure your project to deploy artifacts to Maven Central Repository. There a couple of nice guides with detailed information about all setup requirements related with Maven, Sonatype OSSRH, Nexus Repository, Staging, POM, signing Your Artifact with PGP/GPG, etc.
Once you have enabled your deployment process, this guide aims to distil the core entities involved in that workflow.