There are hundreds of vidoes that go over this so I'll let them do the talking for me; A short but sweet tutorial by Warren Marshall that goes over the process of making a manhole cover. https://www.youtube.com/watch?v=ZSs3S1Zc-oU A multi-part tutorials that goes over making a PBR Prop…
There's an amazing tutorial series called Environment Creation In Unreal Engine 4. You can find it here: https://www.uartsy.com/course/environment-creation-in-unreal-engine-4 I believe you can also purchase and download the series online. It goes through asset creation, preparing for level design, and of course in relation…