How do you go about learning Ada without working in aerospace or a defense contractor? I've never organically run into any software in my daily life or using OS

How do you go about learning Ada without working in aerospace or a defense contractor? I've never organically run into any software in my daily life or using OSS that it is written in it. I know some exists, but it seems to be an incredibly isolated island disconnected from any of the other major programming ecosystems: web, HPC, games, CRUD business apps, finance/trading, embedded (outside aerospace/defense) etc. I don't know of a single major project in any of those fields written in Ada. I work in finance and have interviewed hundreds of programmers working on systems moving billions of dollars around at this point and not once have any of them ever mentioned having worked with it. I am skeptical they have as much to learn from Ada as vice versa, since Ada seems cut off from the majority of brains.