For someone who does not understand computer talk, I don't know what any of that is. Do I need VPN and https?
https is just a more secure connection to a site. most sites have a https option but some don't and can be less secure. it can make sure that site credentials are up to date and anything dodgy going on. you can install the addons through chrome or firefox.
a vpn is a more secure connection and can spoof your IP address so your location is hidden to anyone being nosey. lets you access streaming sites in your location that might be blocked. sometimes the connection can be slow, especially with cheap or free vpns, but generally a good idea, especially now. and even more important if you use wifi hotspots in cafes. certain programs can rip information and passwords if you connect to an open wifi SSID, so its a good layer of protection