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small contains only polygons, so its geometry is a MultiPolygon. big contains polygons and a LineString, so its geometry is a GeometryCollection. While MultiPolygon has a coordinates() method, GeometryCollection hasn't.
big.geometry().coordinates() fails because a GeometryCollection doesn't have a coordinates() method.
big.geometries().coordinates() ...
1
When loading the data, unless it has a known geodetic reference file, the program will prompt you to enter its CRS. You can use the Search by EPSG Code button upon loading as below:
For your first example, this should be "3127".
After this, you'll have set your layer's (and, for now, also your project's) CRS. To change this (in your example you want to ...
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