Most developers use TLS constantly and understand it vaguely, "it's the padlock, it means encrypted," without a clear picture of what's actually happening or, more usefully, what actually breaks and why when a cert issue takes down production. Let me lay out the real mechanics, because the vague...
Source: [Dev.to](https://dev.to/nodevguy/tls-certificates-actually-explained-no-hand-waving-3eka)