This website runs on a home server and a home internet connection. This is mainly just a fun spare time project for me that I use to teach myself about networking, web and file servers, VMs, VPNs and more. Therefore there are no guarantees about availability and uptime, even though I do try to maximize those.
If the website is down, I might be trying out some new stuff that either takes some time, or it failed, or I'm just rebooting for whatever reason. You will just have to wait for me to finish or fix it. It's also possible that my internet connection goes down, as it's a home connection with no uptime guarantees. But as of yet I haven't noticed any problems.