What site or app do you like to use for learning ?

The TED, TEDx and TED-Ed channels on youtube as well as the TED Talks website are all nice. The Royal Institution's youtube channel is also quite nice. And of course there's stuff like Numberphile, Periodic Videos and all the related channels run by Brady Haran.

Outside of that, very decentralized. Lots of various science websites. NASA, Livescience, Space.com, Sci-News, various academic websites and the occasional delving into arXiv. Probably missing more than a few notable mentions, but that's just off the top of my head.

I'd echo the TED talks stuff along with BBC bite size where you get information on subjects for about ten minutes.
Haven't used Open College in a while but that used to be pretty good. Same with the Open University courses.

Amazon. I use it to buy text books!

pornhub, spankbang, xvideos and redtube

PINTEREST has saved my ass repeatedly. Everything is on there.