如何使用VueJS保存用户会话？

I am trying to figure out how to save users session when they log out. e.g. multiple shopping carts, transactions, and even previous searches. I am pretty new to the whole backend language and I am just seeking guidance on the matter. I have tried my share at google-foo for this matter, but have not found any good documentation on what I am trying to achieve.I am trying to figure out how to save users ses