Brain

Steve Mould, Smarter Every Day, Real Engineering, Vsauce, NightHawkInLight, NileRed, How to Make Everything

Food

Joshua Weissman, Guga Foods, Sous Vide Everything, Andy Cooks, Uncle Haji's Kitchen, Tasting History with Max Miller, Babish Culinary Universe, Yueng Man Cooking

Chill

Serpa Design, MD Fish Tanks, Ben's Worx, NileBlue, ClickSpring, The Samurai Carpenter, Kris Harbour, Just Alex, Ly Thi Ca, Hoàng Huong, Primitive Skills (these last 3 are silent channels from Vietnam. I've linked them since these are hard to search for in a sea of that type of content)

Entertainment

mrnigelng, Will Stelter, Thack Ironworks, shurap, Frog Leap Studios, Andrew Huang, Rob Scallon, look mum no computer

Friendlyjordies (main and podcast), Hello Future Me, Louis Rossman, Tom Nicholas, Abroad in Japan, Crunchycat, James Tullos, stephen tries, sidemen, rachel and jun, jun's kitchen, healthygamergg are a bunch off my watch later list.

Well I for one love Both Hank and John Green, Smarter Everyday, Lock Picking Lawyer, Nilered, Jdraper, Kyle Hill, Electroboom, Project Farm, Dr Gloucomflecken, Casual Geographic, Villain Support, Tested, Tom Scott, Frog Leap Studios, Natural Habitat Shorts, Oxventure, Kerzgeszagt, and Glen and Friends Cooking to name a few.