OK....I need to learn about this 'bottom bar' feature....I don't know how it integrates with apps, whether there's a generic interface....

There's lots I don't know...I'm not trying to BS anyone here....I'm an expert professional software engineer, but I'm totally new to this platform - even I need to find my feet

I may not be a religious guy, but I really want to see this through.

Because it's important.