Build robust backends with guides on APIs, databases, caching, and architecture: the server-side decisions that determine whether an app scales.
Injection grabs attention, and authorisation causes breaches. Broken access control has been the top web application risk for four consecutive editions, and it's found in essentially every application tested.
Most database advice stays abstract because the concrete parts require reading a query plan. This goes into the specifics: schema decisions you can't reverse, index strategy, and how to find what's actually slow.
Most advice about mobile backends is just backend advice. What actually makes them different is that the client is a version of your app from two years ago that you cannot change.
Adding a cache takes an afternoon. Choosing the right layer, invalidating correctly, and surviving a stampede is the actual work, and it's where most of the interesting failures live.
Backend history is told as steady progress from CGI to serverless. What actually happened is an oscillation, and knowing which way it's currently swinging is more useful than the timeline.
Every comparison of server-side languages lists syntax and ecosystems. The differences that actually change what you can build are elsewhere, starting with how each one handles concurrency.
Most guides to full-stack .NET could be about any technology with the nouns swapped out. This one is specific, starting with the naming confusion that trips up almost everyone who arrives.
Most backend tooling advice is a list of web frameworks, which matters least. The data layer, the boundaries, and observability determine whether it works.