Hello. It's been a while that I'm trying to memorize all the possible adjective endings, but without success. -ER, -E, -ES, -EN, -EM ? it is a real nightmare!
I'm sure that studying this stuff may cause serious damages to my healthy.
I hung a table over my bed and every night, before to sleep, I look at it. But no improvements. They look so bastards and senseless! I decided that if a day I will invent/develop my own language, it will be a language without adjectives. Or at least only a few. But all of them will end in the same way.
Hey, Italian has -A, -E, -I and -O too. ;-) But perhaps this helps too: http://www.beste-tipps-zum-deutsch-lernen.com/Adjektivdeklination.html
My suggestion: learn the adjectives in the context of a sentence.
Instead of a table, make very little sentences.
Write 'Post-it notes' and distribute them in your flat, change the places every few days.
Good luck!
To make a diagram or something that can make everything more clear, when learning a new language, you need to figure out how to make everything straightforward to you, get a notebook and write something down or a diagram on your computer
fortunately you're not learning Finnish and Inupiaq, they're much more complex than German :P
just remember that these go with cases and genders. Just try to learn them naturally when you use the word and you'll get used to it