Hi, can you explain Question 2, why the data and target are 2 dimensional and 1 dimensional respectively?
data with two rows and a single column, i.e. two samples and a single feature
data = [[1], [2]]
target = [1, 2]
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In scikit-learn, the convention is that X (or data) is always a 2-D arrays of shape (n_samples, n_features) and y is either a 1-D array of shape (n_samples,) or if you are modeling several target, it will be a 2-D array of shape (n_samples, n_output).
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