First steps with missings after reading a csv file

I’ve just read a very large file with CSVFiles on a dataframe called myDF.
I think CSVFiles it’s supposed to automatically create “missings” where elements where missing.
Now how can I see how many missings are at each column?
On R I would use
apply(myDF, 2, function(x) sum(
How can I replace the missings at a given column with some value, for example 0, creating a new column?

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