Sharepoint 2013 for Project Management

I am new to SharePoint. I am interested in setting it up to manage projects but am a little confused by the nomenclature SP uses.

Many of my projects are relatively small and can last less than a day. Some are larger and may take weeks. I am also interested in maintaining a parent/child relationship where I can have one project with many child projects. I also might have hundreds of active projects running at the same time.

With that as the base, would a project be a subsite? an app? or something else? Can anybody clarify the best structure for my use case?
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Yagya ShreeCommented:
If you want to keep it together, then it you parent would be a top level site collections. For each project, you would create a subsite and for child, you would create libraries inside your subsites.
befidledAuthor Commented:
For children of the subsite, why libraries instead of subsites within subsites? just curious what the advantages/disadvantages might be.
Yagya ShreeCommented:
it would be difficult to move content between projects if that it not something you want in future, you can have subsites under subsites as children.

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