I have self-hosted Gitlab on our infra. Now, do I need to pay for anything or purchase a license? If I have to purchase a license then what is the use of self-hosting apart from control over data.
P.S. I am new to this.
Hi,
the Enterprise version offers more features and enables you for a support subscription with SLAs. Some highlights are Epics, Burndown Charts, Project Insights, Security and Incident Management.
You can learn more about it here: https://about.gitlab.com/enterprise/ and https://about.gitlab.com/stages-devops-lifecycle/
The Community Edition provides the core functionality without any proprietary code and is fully Open Source, free to use. Support options are community support on this platform, where answers might take a while 
The feature differences between tiers are explained at https://about.gitlab.com/pricing/self-managed/feature-comparison/
Cheers,
Michael