Introduction to Blockchain: https://youtu.be/SSo_EIwHSd4 

Blockchain with Python: https://youtu.be/4FwBB6vhilU 

Blockchain with java: https://youtu.be/UmCEdcRjaz0 

Blockchain with JavaScript: https://www.youtube.com/watch?v=qF7dkrce-mQ 

Blockchain with C++: https://www.youtube.com/watch?v=2VDQeQfh4Hs