Pro tips: research the distro you're trying to install. And try not to follow any random instructions blindly, that's the quickest way to mess something up.
Ubuntu server is made for actual servers, and they don't need features like a GUI or WiFi.
Just use Mint instead if that's what you're comfortable with. It'll use up some extra storage, but you might want to use a GUI at some point instead of SSH.
If you're planning on self-hosting and opening it up to the internet, invest in VLAN first. It's pretty dangerous to have the server running on the home network. More expensive routers have it built in, but you can DIY a solution using software like openwrt or pfsense, and a thin client. There are useful instructionals on YouTube.