Basic scripting question

Hi,

this is a very basic question ... I am currently learning vim
scripting.

With getline(.) I can get the contents of a line of a buffer.

But: i
How can I replace a line in the buffer with another contents?
How can I delete a line completly so it become an empty one or
vanishes?
How can I insert a line at a certain point?
How can a define the position in the text where this all will happen?

Thank you very much for any help in advance!
Have a nice weekend!
Best regards,
mcc

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