Kurt has a 2013 MacBook Pro. He is worried about how much memory he has, since he only has 8GB. Leo says that macOS has a really good memory manager that can enable it to run with less RAM than other computers. It's really good at releasing RAM when other programs need it. He'll also want to be sure that the extensions in his browser aren't being memory hogs. The best browser on the Mac for memory management is Safari, by far.
Kurt also wants to know if he can upgrade it to macOS Sierra. If Apple recommends it, Leo says he should do it.