SharePoint: Change item in the source table (lookup table)

Question

I am new in SharePoint. I have multiple lists with lookups. In list A (target) I have multiple columns from the list B (source). Currently I have data in both lists. Now I need to change some values for some items (rows) in list B (source). I am curious if I change the rows in list B, will it affect other lookup data in list A (where previous (old) row data is used)? I am sorry if it is a trivial question. I am new and data is quite critical data to make a mistake.

Can changing (some) data in the source list cause issue in the target list?

Answer 1

Change (some) data in the source list, the source data selected by the lookup column will automatically change accordingly. But no error will be reported: