The best website for this is Edureka. Seriously, don’t think you can get all the knowledge you need using one or two websites. This technology is complex enough to make big research. Also, you will need some background programming skills to enter the world of blockchain development.
You can also refer to some of the blogs of blockchain:
Blockchain Blogs | Learn About Blockchain - Edureka
Also you can check out Edureka Youtube video:
Blockchain Full Course - 4 Hours | Blockchain Tutorial | Blockchain Technology Explained | Edureka
Hope this helps!
To know more, Enroll with Blockchain training online today.