bitcoin and blockchain courses site
https://www.khanacademy.org/economics-finance-domain/core-finance/money-and-banking/bitcoin/v/bitcoin-what-is-it
https://www.pluralsight.com/courses/bitcoin-decentralized-technology?clickid=RxVTGbVNkxyOWzVwUx0Mo3EAUkiT9L2OAVen2k0&irgwc=1&mpid=10078&aid=7010a000001xAKZAA2&utm_medium=digital_affiliate&utm_campaign=10078&utm_source=impactradius
https://cognitiveclass.ai/courses/blockchain-course
https://www.coursera.org/learn/cryptocurrency?ranMID=40328&ranEAID=TnL5HPStwNw&ranSiteID=TnL5HPStwNw-BZKQW4iCTwkn9n83.f8ZVA&siteID=TnL5HPStwNw-BZKQW4iCTwkn9n83.f8ZVA&utm_content=10&utm_medium=partners&utm_source=linkshare&utm_campaign=TnL5HPStwNw
https://www.udemy.com/course/bitcoin-or-how-i-learned-to-stop-worrying-and-love-crypto/?LSNPUBID=TnL5HPStwNw&ranEAID=TnL5HPStwNw&ranMID=39197&ranSiteID=TnL5HPStwNw-aDF8Jr3NElQ1Fljru7WdPw&utm_medium=udemyads&utm_source=aff-campaign