Adjectives 1 - Tips and notes. So impressed!
I normally don't read the "Tips and notes" since I am native Swede, but today I did. And wow! That wasn't just hints, it was a complete lecture!
I really like that you included the optional masculine form (e.g. "den långe mannen" instead of "den långa mannen"). I live on the west coast and use this form all the time. It could be a regional thing, since I have noticed that it much less common among Stockholmers for example.
I think it's a generational thing. Swedes are using gender-neutral adjectives a lot more these days. People used to use the "e"-form where it wasn't necessary (it's still quite common).
Glad to hear you like it :)
As for the -e/-a thing; In the spoken language of most people -a is the only form. In many cases the spoken distinction between -e and -a is a result of education. I think that if -e was removed from the written language, people would soon forget it was ever there. That is not to say, of course, that some people (and some dialects) do have it :)
And, as said in the "Tips and notes", even if you never use these forms yourself, it's good to know that they exist.
For example, if you visit Öland:
Långe Jan lighthouse
Långe Erik lighthouse
I will check Adjectives 1's Tips and Notes when I get there for sure. Here, take a lingot for your profile picture :)