https://www.youtube.com/watch?v=0kawSbMQ1v8
This person (Filip Martinsson) works along with @ivanli( Ivan On Tech) on his team. There aren't many videos explaining the coding part of Blockchains but his videos are different.
If you are a coder and want to learn blockchain development make sure to follow this guy. And even if you are not a coder spread the word because growth of blockchain is something we all care about.