I seem to consume a lot of iOS Academy videos with great, short (< 10 minute) explanations of various Swift iOS programming topics - particularly little UI topics, like this one on the Grid View.
I really appreciate the generous content provision in the Swift and iOS development community. Perhaps this is the same for lots of technologies, but for someone who started programming pre-internet, it’s a stark difference to how I used to learn - so many magazines, and so many 2" thick books.