Jew by Birth
Question
I’m 71 year old man. My great-grandmother’s (my mother’s mother’s mother) Jewish family immigrated from Poland in the late 1800s. I first visited a synagogue when I was 14 years old and was told because it was on my mother's side that I was Jewish. I know nothing of the Jewish faith other than from my Christian upbringing, but I feel a desire to know more.
Where can I start please?
Am I a Jew by birth?