Agree with Shayki Abramczyk.
How can I add the work items "User Story", "feature"& "Bug"?
We could create work item via Agile process, then we could add work items User Story, Feature and Bug.
If you still want to use Basic Process template and your TFS version is Azure DevOps Server 2019 or later versions. You could create collection via Inheritance process model, then open Collection Settings->Process->select Inheritance process->click the button New work item type to add new work item type.

If you are using On-premises XML process model, you could refer to this doc to add work item type.