Which Apple MacBook laptop should I buy?

Mary needs to replace her 2009 MacBook Pro but is overwhelmed by the options. Which is the best choice? I have soldiered on with a 2009 MacBook Pro, which I use for internet access, social media, photos, and my research. But in order to access the university library remotely, I have to use an up-to-date operating system, and my Mac is so old I can no longer update it.So, I need to buy a new MacBook, but I am overwhelmed by the options. Do I need a Touch Bar? How much memory and SSD do I need? Ma