How to learn blockchain technology from scratch?

How to learn blockchain technology from scratch? I am trying to learn this innovative technology and last one year I have been reading different tutorial posts and several Blockchain related YouTube videos, top Crypto forums but still I am not more familiar with the technology to start my first block chain project. In addition, I want to start a business using block chain technology buy still confusion where and how to start. I read more than 50 blockschain start up business concept, but I do not understand how to start.
You could skip the high-level programming of blockchain itself if you know basic rest API and then simply integrate an already built blockchain protocol and multi-chain wallet with an open source network like Arkane Network. Then you can focus on the service you are providing as opposed to learning the highly technical development of blockchain code. Just a thought...