Triggers in SQL Server

Hi, thanks for your answer

But I have some more uncertainties, hope perhaps you can clarify

If you assume that you handle each row independently in a trigger, can't this leads to errors? Assuming that the inserts and deleted tables always only contain one row,when they actually can contin many?

How does the insert/delete table look, is this dependent on the original table itself (table where the update/insert/delete was made) or is it dependent on the colums updated/inserted/deleted of the original table?

M.G