your question is not clear because you keep repeating the term "learning" but you never mention WHAT!
learning in this context can mean a ton of things. from the basics that someone needs to understand what to do in this world to the advanced topics such as cryptography and coding a blockchain technology related application. and for each of them there are very different resources that one can use. for example for basic stuff as it was mentioned, coindesk articles and Andreas Antonopoulos are the best in my opinion. a little more advanced and you'll need to look at bitcoin wiki, developers' documentation and read those. as for code you'll need to look at some source code of your favorite projects and try learning that way.
then we have the topic of trading which nearly has no useful source that you can learn and learn from. most of them (like the websites, youtube videos,...) are made by newbie people who have no idea what they are doing in this market.