I use a 2009 Macbook Pro as a desktop 98% of my time. However, I like the versatility of the laptop when traveling. I am looking at the 2018 Air. There are two Thunderbolt 3 ports. However, I have already spent 3+ hrs trying to "just simply" find information about an adapter to connect the 8 year old HDMI monitor; a USB Hub 2.0 or 3.0 with printer, keyboard, mouse dongle, backup HD for the time Machine and a new External to use since the Air I get will most likely only have 512MB of SS space. All of this stuff is connected currently. I found a "Plugable" USB-MD101 which appears to be able to connect the laptop and the power ... it has an hdmi and it has a usb port, shich I would assume I could connect the hub to ... and I'll need something that allows me to connect the TM Backup and the External I will need as I have a limited budget for the internal (128 or 256MB). All work with El Capitan. "It depends" and "maybe" isn't going to help me as I cannot afford to purchase a laptop to "just" find out. And add a macmini or imac for "most of the time." My total budget is $1200-$1300 +/- before the hubs or Applecare . My configuration of a laptop as hard drive has been perfectly fine. So, is there such an animal? And is USB-C and Thunderbolt 3 the same thing? And what's with Displaylink? See ... layers of the onion ... And I assume that the laptop will deliver with Mojave ... thanks in advance to anyone who can help.