Function-first means that your project is structured by functions like actions, components, containers, modals, handler. However, there is the problem with scaling – it will become more and more difficult to maintain the overview since features are scattered through the whole codebase. Moreover, it usually violates the principle of locality (german: Lokalitätsprinzip): code which is executed together, should be also structured together.
Feature-first takes the whole other direction. The functions are scattered but the feature itself is self-contained and closed – actually the same structural approach you would choose for defining modules. In my experience this is a good way to structure an app which can easily scale – as long as (naming) conventions are defined on how the features/modules are structured. Inside a feature I would usually structure by function.
The three keywords from the title Dependency Inversion, Inversion of Control and Dependency Injection are fundamental to be understood by any developer. In this article we will take a close look into them – there are NOT the SAME. At the end, I collected a list of articles recommendations.
There are tons of articles with this title and now there is also one from me. Actually, I started from this Toptal article for Rails developer and enriched it. In most cases, I was more restricting than the original article.