Adjective Endings Confusion

Hallo! I’m in my second year of German, we’re currently learning adjective endings as well as how they function in terms of the superlative and comparative cases.

I was absent for 2 weeks and I missed a lot of the instruction, and I have a test on it tomorrow that makes or breaks my grade.

My instructor gave us this cheat sheet, but I’m not entirely sure what it means in terms of adjective endings, and I’m also not sure when you’re supposed to use them.

The cheat sheet has the following, alongside a table with different endings:

„der Wort”? —-ja -> ‘e’ is in Oklahoma

„ein Wort”? —-ja -> somethings ‘wrong’ in Oklahoma

Kein Artikel —- ja -> RESE/NESE chart applies to endings

Sorry if this is a stupid question.