Copying files in linux?

Question

linux

Hello everyone, I need to copy the contents from folder A to folder B,
I do it with the command: cp -r A B
then go to B: cd / B and write ls
I see that now there is inside folder B And I don’t need it, how to write the command so that inside B would be the contents of A and not the folder A itself?

Answer 1

cp -r A/* B

Answer 2

More correctly:
cp -a /source/. /target