Highly recommend the appbrewery flutter bootcamp (it’s a video course). It’s $10 and will get you up and running quickly. I have no affiliation with them other than as a happy customer.
I like Flutter a lot, but I'm not a fan of Dart. It's a false friend, it makes you believe it's simple and mostly a copy of your favorite language, but once you start to dig a little deeper it feels like something bolted on, hacky, not designed.
I come from the .net world which is the exact opposite: C# is a superb language but every UI framework MS has ever produced is sub par. Now if I could get Flutter with C# I would be a happy man.
There's too much syntactic sugar for my taste to the point it gets diabetic.
Callable classes really? For example you can write MyClass()();
Underscore to mark a variable or a function private, but you can still use an underscore to declare a variable inside a function so it muddles the comprehension. Are we going to lose some precious milliseconds if we have to write private in front of a variable?
There's also the need to use buildrunner for almost everything since the language wasn't thought out for modern use cases. It works, but this is very inelegant IMHO. When I peak at the generated code I don't feel fluent in Dart quite the opposite.
Then there's the ultra strict linter that won't let me add an empty new line where I want. The resulting code is very compact and is harder to read.