Need? No. Could reasonably be better at development if they did? Yes. Nobody "needs" anything, so it's not a fair standard to set. I'd say if you're a devel

Need? No. Could reasonably be better at development if they did? Yes. Nobody "needs" anything, so it's not a fair standard to set. I'd say if you're a developer and you don't know about something on this list, you should probably learn about it. Master? Nah. Know what it is/means? Yeah.