To explain the setup a bit, the default configuration opens a webserver on localhost port 8000 that serves pageviews to you and allows you to browse and post to the p2p database, which connects to other nodes in the background.
If you want to make this into a publicly facing website via nginx or something, there is the option to enable "gateway mode" where you can enable or disable certain features (like the ability to delete posts) for public users accessing it over the internet. Essentially this allows other people to interact with your node over the internet and post using the traditional client-server concept. You can also disable all features when not logged in, making it so only you can browse and post and moderate when logged in (eg. from your phone or another computer elsewhere) but other internet users won't be able to access the content on your node.
I've gotten a node to work and successfully replicate posts and files on Android in the past too, using Termux, so you can also do that as well.