Hi and welcome to the forum.
I have seen other post/s here on the forum of users experiencing freezing when using Brave browser. Have you tried any other browser?
You should easily be able to create a swap partition when using the "something else" installation method. I have always done that. But if you are installing on SSD the consensus is thta you should not need swap. If you want to make changes to add swap, meybe this will help: Create a swap partition on already existing drive with zorin os installed