If you have a Windows pc and an Nvidia graphics card, the process of getting set up is even easier than the one shown in the YouTube video.
I like this method because it's all self-contained in a single folder on your computer, and you don't even have to mess with git or python. You can even install it twice in two different folders if you want a "clean" copy for SFW creative work and an isolated "naughty" copy with all of your depraved fetish loras (loras are highly-focused training models for specific prompts).
Official Docs here: https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Install-and-Run-on-NVidia-GPUs
I just go to onlyfakes.app and mess around. Outputs are probably much slower than the other suggestions. There are a few different engines to choose from.
https://aqualxx.github.io/stable-ui/
Allows you to create without your own hardware. It uses distributed computing.
If you do have the hardware you can join the AI Horde. Which gives you priority when there is a que.
Piratediffusion. It has a thousand pre-installed models in a UI accessed from telegram or from their website. It costs around 20€ a month, but it's worth the price imo, for infinite generations.