when you say your are looking for a painting website, in the scenario that you really mean free digital art program, here are some open sourced, free, programs you may find usefull.
gimp – image editor
inscape – vector graphics
krita – painting (the one you probably interested in the most (not sure about the unstable, I’ve never used it, but I’ve heard positive things from people who have)
(not posting links because I’m unsure about the polity, but a quick google search ought to do it)
Hope this helps 
Krita is free and has a lot of tools if you are interested.
There’s a lot of websites I highly recommend:
Photoshop - not really a website, more like a software.
Photopea - as a beginner
paint.net - as a beginner
If you have windows go to your search bar and type paint you will have a paint app
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It’s not that good of an app. Nor Paint 3D. Isn’t it kind of outdated?
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Not really it hasnt been updated but does work like a charm
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MM… I kind’a doubt that. There isn’t much features, not alot of customization. In other words it’s really limited.
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What features aren’t there though?
If you want to keep it simple, use Pixlr, otherwise use Photopea.
1, most of the drawings there are very low quality. 2, it’s really outdated. 3, there is no like: gradient, magic wand cursor thing, limited brushes, strokes, limited fonts, saturation, hue, contrast, satin, glow effect, knockout effect, etc.