I found myself in a situation where I wanted to say:
I’m a beginner, your German is better than mine!
My first attempt was wrong, because I said:
Ich bin Anfänger, dein Deutsch ist besser als mein!
I was corrected and told to use meines instead of mein. Thinking more about it, I knew mein was wrong but couldn’t articulate why meines was right.
Is meines used here because you need the genitive declension of the pronoun mein, since it’s referring to the possessive my German?
I guess I could have avoided the pronoun, and also said:
Ich bin Anfänger, dein Deutsch ist besser als mein Deutsch!