For those who want to start dipping their toes in the water understanding the basic of blockchain. This lecture might be usefull
But for those who want to learn blockchain as a series of lectures like Business, Finance Economics students at the university (not computer science student) learn. The series lecture from Gary Gensler might be more appropriate. Gary Gensler, the current Chief of Securities and Exchange Commission (SEC) was a former professor at MIT teaching block chain and crypto.
You could find most of his lecture on YouTube using the search word, for instance “gary gensler’s crypto and blockchain”
“1. Introduction for 15.S12 Blockchain and Money, Fall 2018 - YouTube”
You could also find his lecture among with other open lecture in MIT OpenCourseWare including Blockchain intended blockchain cryptography intended for computer science students.
MIT OpenCourseWare - YouTube