In addition to that, I don't think people should overthink the rack as an essential component. I like racks as much as the next guy and homelab racks look really cool but for usability and learning, just go with whatever you like.
I personally have 4 boxes stacked in a corner that are connected to a "rack", which is just two rack side panels bolted to the back of a workbench that I screw components into, connected to NAS and multiple Raspberry Pi's on a shelf and I really like the mess and have learned a lot.
Just use what you have and expand as you need. Racks are cool once you're into the hobby enough to care about style points.
I personally have 4 boxes stacked in a corner that are connected to a "rack", which is just two rack side panels bolted to the back of a workbench that I screw components into, connected to NAS and multiple Raspberry Pi's on a shelf and I really like the mess and have learned a lot.
Just use what you have and expand as you need. Racks are cool once you're into the hobby enough to care about style points.