>>1677653Part two: Posting sites.
These are sites specifically devoted to the archival of the above. They aren't terribly precise in their selectivity, but if you're not willing to spend time getting the right tag and sifting through the galleries, chances are you should use these.
1. Danbooru.
https://danbooru.donmai.us/Like Pixiv, this is pretty much my bread and butter for artwork. Unlike Gelbooru, Danbooru's culture tends to promote detailed listing of source and documentation regarding images, which is very important if you tend to use it to reach the above. That said, the two-tag policy is kind of annoying - it can be handled decently if you're clever though.
2.
Yande.re.
https://yande.re/This is good for high-res stuff, though since most of it is from scans it's not like source is going to be posted often. Usually it's provided when available though.
3. Gelbooru.
http://gelbooru.com/Only really useful in my mind for getting that's not already on Danbooru. Also lolis, I guess.
4. Konachan.
http://konachan.com/I have literally only used this site to find one image so it's hardly something I find myself using often. That said I felt it was worth posting.