Where to create a portfolio project details layout page when click a project?

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Sorry for the stupid question, I’m total non technical guy, this is my first time use wordpress, I’m a designer, now is designing my website, but I wondering where I can create the project portfolio layout details page in wordpress?
Not the portfolio display(like gird)page, but the each project details page when you click a project.
like this kind of page:

I have already created a project layout details template and saved a pattern, but then how? Is this correct?

Thanks in advance.

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