This is a cool list that would help build your understanding about Blockchain ranging from technical to non-technical, beginner to professional.

Blockgeeks

https://blockgeeks.com/

Crypto Zombie

https://cryptozombies.io/

Consensys Academy

https://consensys.net/academy/resources/

Zastrin

https://www.zastrin.com/

Solidity Documentation

http://solidity.readthedocs.io/en/v0.4.24/

Etherem: Create your own cryptocurrency

https://ethereum.org/token

Ethereum: Crowdsale

https://ethereum.org/crowdsale

Ethereum: How to build a democracy on the blockchain

https://ethereum.org/dao

Lisk Academy

https://lisk.io/academy

IBM Blockchain Dev Center