We used to have a song for "sur sous dans, devant derrière" in elementary school, complete with hand motions, and it helped with memorization ( i may or may not still use this song sometimes to jog my memory in high school french class)
There are 16 verbs in French that require être rather than avoir in the passé compose. Sometimes there is a passé. Passé uses être to talk about physically passing by something. These irregular verbs also must agree in gender and in number.