hi @Prashant Deshmukh , welcome to the community.
I would refer you to the atlas in documentation is a great place to get started. Here is a link to one article that may be beneficial - Set up your site and spaces
Is note that when you create a project inside Jira Cloud should percent an option to create a confluence space associated with that project. I'm unclear if that is really your goal. You may simply be asking about how to create a Space.
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