Google.
I know what sounds lame, but that's how I learned. I started to google about blockchains. Then I would keep reading and reading for hours and days. I would google everything I didn't understand. I read it as many times as I needed to in order to grok it. I went down many rabbit-roles and read many whitepapers. Keep reading and eventually, you'll get to a place where things start to make sense and click.