I really want to start creating professional mockups for my branding projects and for my portfolio but don't know how to create perspective like this.
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The fastest way would be to use the perspective grid tool in Illustrator and import the shapes into Photoshop as smart objects.
To do it only in Photoshop, I would use the Perspective transform tool.
From there you just adjust as needed. It may also help to adjust with distort as well since it has a bit more freedom than most of the other tools under transform in my opinion.
Hope this helped.