[badminton1]

Logging, monitoring, etc... is of no value if you do not have an intuition of what to monitor.

Monitoring is mostly reactive, to stay afloat you should focus on prevention: know your code, keep it clean, test it, do load testing... and monitor it.

[kaspm]

All of these answers are too simplistic. There's no single answer in what to learn to become a software engineer. If you have no development background, learning javascript, node, react is a way to start down the path then build your skills as you progress.

Personally, I recommend learning domain modeling and understanding entity relationships, primary and foreign keys then SQL. Great foundation for engineers at most companies.

[badminton1]

That is good enough if you are going to be supervised by a senior developer that can mentor you, but is still not enough to be an autonomous developer.