"In the early 1930s" what years are those like 1900-1930 right?

No.

The early 1930s would be from 1930 to 1933 or 34.

The phrase "early 1930s" refers to the first few years of that specific decade. In order to determine the exact years, you can take the mid-point of the decade as a reference point, which would be 1935. Therefore, the early 1930s would generally encompass the years from around 1930 to 1935.