Here's an example of a strategy

“I wanted to learn whether to use ser or estar with adjectives to describe how people feel or what they are like (feliz, emocionado, contento, alegre, optimista, satisfecho, triste, and deprimido).  The problem is that in Spanish, some of these adjectives can be used with both ser and estar and others tend to be used mostly with estar.  So I created two lists in my mind:

Then, I created a mnemonic using the initials of the verbs in the second group: CSTED. 

Next, I thought of something silly:

I have to remember that there isn't a word represented by the letter 'A'."