We all have holes in our knowledge. We all, generally, specialize. I have never worked with 'big data', implemented any part of a commercial web site, or work

We all have holes in our knowledge. We all, generally, specialize. I have never worked with 'big data', implemented any part of a commercial web site, or worked on HPC(just to give a few examples). What may be useful to one may be useless to another. Definitely think about Software Engineering. Maintainability, debuggability, extensibility. Don't get lost in stupid details. Don't nitpick the coding style or try to optimize code that isn't currently meeting the requirements(if there are requirements, and if there aren't you should try to define them).