I won't pretend that I can do justice to such a large subject. However, - - - They all connect contrasting ideas. The "though" versions are called "subordinating," and "concessive," because they give one idea less importance than the other, or you're admitting (conceding) that the less-important thing is true or exists.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.