Jira project is a a collection of issues and all issue belongs to a project. Each project is identfied by name and key.
Issue can be bug, task, ticket, leave request etc.
Components are sub section of a project.
Jira workflow is the set of statuses and transitions that an issue goes through during its lifecycle.
There are three default groups
Jira-administrators – full access
Jira-developers – can add/edit tickets for assigned projects
Jira-users – only viewers