I have to admit that resources on Ada are a little hard to find.
The use of three simple letters as a name makes it particularly hard to find resources on google to learn the language. Specially as a first language.
I don't want to hate the Americans with Disabilities Association, American Dental Association, the American Diabetes Association, the Audio Design... but honestly I hate when the search comes up with any of them.
That's why I'm hoarding all resources I can find with the hope it's of your best service.
In no particular order: