I am kinda happy that my Tor hidden service is/was running.
So after i turned off the PC, i decided to search my website on Tor Browser (on mobile phone), and the result said "Server not found"
Question -What might have gone wrong? -Would it be a must, for my PC and Tor service running on ubuntu, before my website could be found on the Tor Browser?
The computer running your hidden service must be running for it to be accessible. Small single-board computers like a Raspberry Pi are a relatively inexpensive way to run an always-on service (but they can't handle a lot of traffic at once). If you aren't worried about anonymity, some people also run their hidden service on a VPS which is much simpler to configure.
Tor is not like ZeroNet or IPFS, so when you're connecting to a hidden service - basically you're connecting to the server that is running a service, i.e. there's no offline cache like CloudFlare, even if your website is a fully static one. You have to keep your server running to access it either directly or through Tor. If you have a fully static site and you need it to be online while your server is not - just migrate to the ZeroNet, it's the right spot to be for you in this case.
