Understand key concepts in the (web) framework you are using. By sticking to patterns defined in the framework, you'll save a lot of time/confusion and prevent

Understand key concepts in the (web) framework you are using. By sticking to patterns defined in the framework, you'll save a lot of time/confusion and prevent easily avoidable problems that accrue debt well into the future. Example: Junior is confused by where to put a new file/module/function in a frontend app and the app is built with Angular. Angular has Models, Components, Directives, Services, etc (I don't really use the framework, but same applies to Rails with MVC, Concerns, /lib, etc). Learn your framework's constructs so you can frame your solutions in terms of the frameowork. You'll be more productive by reducing the scope of your decisions. Downside: you won't be able to find the 'best' solution to your problem - you are constrained by the framework's model of how a webapp should be built. This is ok, you are learning the ropes, so an increase in productivity is worth the constraint in freedom to choose. First, imitate and understand why the framework does these things and what problems it means to solve. Once you've seen enough of these patterns/opinions (hmm maybe binding the view to a model manually isn't such a good idea, i've been forgeting and causing memleaks - hey Backbone days!) and have real life examples of where the patterns present problems, you'll be able to improvise/tweak/decide-yourself.