When you interview, you might get a question about algorithms or data structures: and then you panic. You went to Zip Code, not a CS degree, you're a solid programmer, but your theoretic underpinings might be somthing you worry isn't strong enough. #basta
Take a look here: https://hackernoon.com/50-data-structure-and-algorithms-interview-questions-for-programmers-b4b1ac61f5b0
A lovely collection things that you might get asked. Hell, you might have done a lab that demands you solve some of these.
Get reading. Reading is fundamental.