Know your weaknesses, and don't be afraid to admit them.
I'm mainly a front end developer, and I have a lot of experience with server side tech (Apache, Tomcat, Node.js/Express/Koa/Sails/etc), as well as several flavors of Linux administration. I'm more than happy to do my best and answer any questions about those topics, as well as provide resources for learning more.
The minute you ask me a database question, I'm going to stop you, and tell you that I don't know enough to provide good or accurate information, and you're better off talking to a DBA. I can read SQL, I can write some (bad) SQL, I can use an ORM library to interact with a DB, and if it's Postgres, I can do enough on the command line to be dangerous. Outside of that, my knowledge of databases is very limited, and I make no attempt to hide this fact. I'm starting to learn more, but the fact of the matter is that for my day-to-day job, it's not needed
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