Currently, I'm working as a frontend dev. I work with Angular. Also, have experience with Dart/Flutter. To learn some tools for the backend, what should I choose ASP.NET Core or Spring Boot?
Given you have cross platform experience (dart, angular) I would recommend spring boot. It is a powerful platform, allows you to easily integrate with many standard tools: databases, message queues, … And you have the freedom to deploy your applications on every platform that has Java or containers available - so virtually everywhere.
I advise you to go for spring boot: it's the future. Just look at the statistics: spring boot is far more used and spread.
It's very easy to use, easy to install, easy to learn.
You'll not regret it!
Given Angular is written in TypeScript, C# will feel more familiar to you. Other reasons to choose ASP.NET are that it's one of the fastest frameworks out there for any language, has a lower learning curve compared to Spring Boot, allows you to quickly build JSON Web APIs and uses less memory. Another notable option if you have a lot of TypeScript code you wish to reuse is Nest framework, which is a TypeScript framework that uses the same architecture as Angular but for back end APIs. I would still choose ASP.NET over Nest but it depends on what will give you more benefits.
Thanks,
I already started learning ASP.NET.
Got a course on udemy: "Build an app with ASPNET Core and Angular from scratch".
