If only “technology” consisted of discrete things you could learn. In the real world all technologies are built on earlier technologies, and rely on other techn

If only “technology” consisted of discrete things you could learn. In the real world all technologies are built on earlier technologies, and rely on other technologies, so really you’re asking at what layer of the onion to start with, or where on the onion to slice off a piece. It’s not clear what you mean by “technology.” As stated the question seems analogous to asking what one grocery you should buy.