You don't start off having to know everything. You start off picking off small problems that don't require deep knowledge of an entire stack. Then you have to

You don't start off having to know everything. You start off picking off small problems that don't require deep knowledge of an entire stack. Then you have to know everything: there's no question a full-stack dev has to know a stupid amount of stuff. I've drawn a line at all but the basics of devops; it's not something I'm interested in, and even though it's important, it won't be where I focus much attention.