Shameless plug: if you want to become less confused about USB-C my primer is at https://superuser.com/a/1200112/41259 https://superuser.com/a/1200112/41259 and

Shameless plug: if you want to become less confused about USB-C my primer is at https://superuser.com/a/1200112/41259 https://superuser.com/a/1200112/41259 and also https://www.reddit.com/r/thinkpad/wiki/newdocks https://www.reddit.com/r/thinkpad/wiki/newdocks contains some helpful intro.