You'll be able to edit permissions for a user or a group. Atlassian does recommend you to add the user to a group instead of giving permissions to a specific user.
You can see what each permission means here along with how to add here: https://confluence.atlassian.com/doc/global-permissions-overview-138709.html
In case this answers your question, would appreciate you to accept my answer :)
Let me know how you go.
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