What do I have to consider if I want to scan an ip address anonymously (via tor) with nmap?

what is considered the best way to browse the web and interact with technology in general and remain anonymous if your threat model includes 3 letter glowboys?

I've always been curious as to know how do people get to setup their websites on TOR and assign the .onion domain. The questions are:

1- How do people assign specific name in their supposedly random name in their website name (Check duckduckgo onion website address or protonmail or even Facebook and you'll always see their names as the first thing in their address, followed by some random characters instead of the usual one like 8chan.moe on .onion)

2- Do you necessary have to have a website on the clearnet, before assigning it to the dark web? If so, then how do people upload CP on a dark web website without any of the materials gets tracked to its original clear net IP address servers?

3- What's with the hate about Javascript and how dangerous can it exactly be to someone who uses TOR?

I know that these type of questions you'd expect from a newfag, but I just decided to ask, instead of just blindly following whatever is being told.

It is allowed to paste copypasta or any external materials to answer this thread here.

Anyone interested to have old school hacker chat anonymously? And I really mean it, truly anonymously. Anonymous deep webs chat using SSH, that's right, no web / js soykaf.
ysdr3c3j7odl3p2zu5vdyaphf5x65l4hc3i2hmuy4vx4svibnxonvsqd on the onion network and port is 1337 protocol SSH as mentioned earlier.

A new no-logs anon chat service with pictures. Open source and easy to host. Auto-reloads allow live hacking of the code without losing the messages that are only stored in RAM.

Setup your own instances for whatever groups you need on Tor/I2P. Recommended to run as systemd unit with DynamicUser=yes sandboxing but runs also on terminal with a simple command and is secure without any sandboxing. Does not write any files nor use any database.

Finnish instance:
chattaavacmowol2z62co2p3mmqmuoe6otlmbtthwngracvzc6pixgyd.onion

Anyone got any repos of gpt4 API keys? Need to try something out but am poor

youtube-dl.org and yt-dl.org now show this error.
>Due to a ruling of the (((Hamburg Regional Court))), access to this website is blocked.