The exact set of steps varies by application and whether you are on a self-hosted instance or an Atlassian Cloud instance. Additional variables are introduced when you are connected to an external directory. If you can give us more information on your environment, we can be more helpful.
Some general things about users, however. In the Atlassian paradigm, you cannot delete a user once that user has done work in the system (opened an issue, participated in a code review, added a page, etc.) You can disable them so they don't consume a license, however. If you are hooked up to an external directory, such as LDAP, when the user is disabled in LDAP, they can be automatically disabled, but this depends on how your external directory is st up in the application.
User creation can be a manual process, and again depends on which application and whether you are connected to an external directory. It can also be an automatic process where the user is created in your external directory and synchronized with the Atlassian tool. The tools can also be configured to create a new user upon successful login attempt.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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