Master JavaScript with guides on modern syntax, async patterns, and browser APIs. Write cleaner, faster code for front-end and server-side work.
Which front-end testing tools actually earn their place, which techniques belong at each layer, and how to combine them without turning CI into a tax on shipping.
Server-side and client-side rendering are the two ends of a spectrum, and most of the interesting options sit between them. The choice depends on the route, not the application.
MEAN, MERN, and MEVN each encoded assumptions about how you build a web application. Nearly all of those assumptions have since been broken.
Front-end does not evolve in a straight line, and the confident predictions about its future have a poor record. What the misses have in common is more useful than any new forecast.
Most front-end security advice is really server advice wearing a different hat. These practices live in the browser, where your code actually runs.