A distinct Jewish culture known as Ashkenazi, or Germanic Jewry, appeared by the 10th century.
Yiddish is a Germanic language with about three million speakers, mainly Ashkenazic Jews, in the USA, Israel, Russia, Ukraine and many other countries.
The every-day language of the Ashkenazic Jews was Middle High German.
They also used Hebrew and their German included Hebrew words and phrases.
I am a great believer in speaking the language right from the start of your language learning journey.
Many people have the attitude that first they must learn all the grammar and huge amounts of vocabulary before they could ever be ready to start conversing with native speakers.