Helpful peeps for your own stuff cos some dude called Dave asked me about it on the bus for his alternate reality My Little Pony fanfics:
On yootooob:
Artifexian
Overly Sarcastic Productions (specifically Trope Talk)
Tierzoo (for anyone inventing species)
Monsieur Z (alternate history ideas)
Alternate History / Knowledge Hub (alternate history ideas + random facts)
Hello Future Me (very world-building specific)
Terrible Writing Advice (laughs and getting the best advice around)
Writing With Jenna Moreci
Kurzgesagt (sci-fi in particular)
Betsy Lee (fun)
Lord Bung's Confinement (sad fun + gateway into SCPs)... Lord Bung's other stuff is mostly "Y hoomanz stoopid?" oriented.
Spacedock (sci-fi specifically: especially for understanding space ship design)
Ellen Brock
UniversalHeat (apocalypse juice injections)
Shadiversity (weapon realism)
Tale Foundry (myths + general writing/worldbuilding jazz)
Khonjin (quite simply the best character advice imagineable)
The Templin Institute (checking if someone stole your idea before you even came up with it + awesome monologues)
Super Science Friends (hmmm yes very good world-building advice totally)
CGP Grey (because knowledge + making everyone pro-immortality)
Your Mum
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If you've seen this comment you now have the Curse of Dave. You must now either write an original My Little Pony fanfic in the comments here or make a nice article.