1. Adjektive Endungen Notizen
Warum?!

2. 2 Types of Adjectives Descriptive = comes after noun; no ending
Das Haus ist schön.
Meine Katze ist alt.
Attributive = comes before noun; needs ending
Das ist ein schönes Haus.
That is a pretty house.
das Haus
Das ist meine alte Katze.
That is my old cat.
die Katze

3. Which ending do I use? What case is the noun? Subject – Nominative
Who or what is doing this?
Direct Object – Accusative
Who or what is being “verbed”?
Indirect Object – Dative
To whom or for whom is this being done?
Possessive – Genitive
Is this object showing possession?
Is there a der-word, ein-word or article before the adjective?
Yeah?  Follow the chart for each one.
Nope?  Add the der-word endings to the adjectives (on the chart).
Believe in the chart and it’ll believe in you. 
OR if there is a preposition that makes it change to this specific case regardless of objects.

5. Examples – Nominative Masculine
Article
The good dog.
Der gute Hund.
Der-Word
This good dog.
Dieser gute Hund.
Ein-Word
A good dog.
Ein guter Hund.
Adjective Only
Good dog.
Guter Hund.
This is an example of the 4 ways an adjective ending can change just in the nominative masculine case. Pay attention to the consistent pattern of “er” in this case.