USB 2.0 OTG Hub extends the micro USB OTG port on Pi Zero
Baseus 6-in-1 USB C Hub, Type C Hub to 4K/30Hz HDMI Adapter with 100W Power Delivery
USB hub - Wikipedia
usb hub - How does a USB Hub work? - Electrical Engineering Stack Exchange
How USB Ports Work | HowStuffWorks
How USB Works | TechSpot
How DIY USB Powered Hub - Raspberry Pi Forums
At try #5, my USB hub finally works! : r/PrintedCircuitBoard
Amazon.com: USB Hub Split Multiport Adapter - USB 3.0 Splitter for Multiple Ports to Laptop, Multi USB A Port Expander for PS4, 4 Port USB Hub Connectors, 900mA Volt Charger, No Powered,
FAQ: USB hub does not work - Orico
Connecting multiple USB cameras to a computer - ANY-maze
Question related self powered USB Hub - Electrical Engineering Stack Exchange