Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Andrea
I am Dave, an Independent Advisor, I will help you with this . . .
Rest assured, you will not need to purchase Office2019 again, and yes, you will get updates, if you purchase an Office Home and Student 2019 licence, that is a perpetual licence, you can install that on one PC or Mac at a time, then when you change laptops, you can then move your licence to that by installing Office on the new laptop using the steps on this page