It sounds like you came across documentation for how to host a Lemmy server. Can you explain what it is you're trying to do? I'm not sure what you mean by "use the official web app."
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Well, I use Jerboa but it's unstable. So I went to that page: https://join-lemmy.org/apps and tried to link to "official web app". But I came accross Github a few other times and I'm always confused...
The “official web app” is how people can self-host Lemmy, to access it as a user it's just the website.
Got you thanks. I'd still like to find a basic tutorial on Github one day.
If you're not a developer all you really need to know is how to check a Readme file, and the releases page.
Usually for these things there's downloads in the release section. For example, Jerboa's repository has an Android APK you can download directly from the releases page there. But you can also get it from F-Droid and Google Play.
You've guessed right, GitHub is for developers. If you don't want to be dealing with source code, you probably don't have any reason to care about GitHub.
Others have already covered your particular use case: you found the code for the web UI for lemmy, it's only useful to server admins. As a user you just go to the website, in this case lemmy.ml.