Hi @Hui Zhang ,
There is no limitation on number of projects and number of issues. You can have any number of projects or tickets.
Atlassian didn't mention any limitations on project/issues. You can refer below link for differences between free, premium and standard plans.
Hi @Hui Zhang - Welcome to the Atlassian Community!
You probably have the ability to create more than you should one a single instance. Especially, since you are on the Free plan. You should be fine.
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You can create as many as you need. Is there a goal in mind?
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You should be fine.
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