Hosting A basic website (with javascript) is a great place to start.

I mainly use docker for everything and you can get a simple http server docker point it at a folder containing your html files and now you have your own selfhosted website.

Use something like duckdns.org for a domain and dyndns to update the ip address to point to your home ip and have your router forward the http port, now your website can be accessed from outside the home network too.

Once you get a basic website working, its easy to keep going and try adding new services. I use dockge to manage all my docker services now but when i first got started i found dockstarter to be very easy to use, kind of like training wheels for docker until you feel comfortable enough to edit compose files directly.

I currently pay $8/month for a basic VPS which i use because i have a lot of public services but if you are just managing your own stuff or another user or 2 you dont even need that really.

For document storage id go with Nextcloud. If you want to also have dedicated music streaming i really like mStream for its simplicty but theres also a number of other services that support the subsonic protocol which has a lot of good clients to choose from for playback.