The most frequently used tense when talking about things that happened in the past is the perfect tense.
The perfect tense is made up of two parts: haben or sein and the past participle (Partizip II) of the main verb.
Separable Verbs
Inseparable Verbs
The past participle of separable verbs consists of the separable prefix/part and the participle of the stem verb, which means that ge-is between the two parts.