If you just want to mess around to see what it's like I would recommend trying out something like
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You generate images for free using a daily quota and you can earn more quota by interacting on the sites, like posting images, reacting to others images etc. Idk how it all exactly works cause I just use a local setup. I've never actually created an image on either site lol. But I use Civit on a daily basis to download everything I could possibly need or want to try out, all my checkpoints, loras, etc.
Or you can try out this site. unlimited free generations and not really any censorship. Not as many bells and whistles like Civit and Tensor. A good place to dip your toe into generative AI and see what it's like. (this is where I started and got hooked)
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After that if you find that you enjoy it and decide you wish to take it more seriously go for a local setup(if you have a capable PC of course). You will not be limited with quotas and censorship. Hell you can make illegal shit if you so desire.
Refer to this post for guides on everything you will need to get started with a local setup.
https://f95zone.to/threads/ai-art-show-us-your-ai-skill-no-teens.138575/post-15489138