How to learn German types of prepositions
Place prepositions indicate the position or location of nouns, pronouns or articles. Time prepositions or temporal prepositions indicate the connection between these things and time.
Place prepositions are equivalent to the questions "Where/Where ... to/Where ... from?" Some typical prepositions from this group are:
Prepositions of Time (temporal)
The prepositions of time are the questions “When/how long?” Some important prepositions are:
In German, no preposition directly precedes a year.
Ich bin 1990 geboren. Ich bin im Jahr 1990 geboren.
(nicht: Ich bin in 1990 geboren)
When you read or hear German, you often find a preposition before the year. This is an Anglicism and is officially considered wrong in German (at least for the present).