Learn X in Y minutes has a dedicated site for Solidity development. In it you'll learn how to use the Remix Online IDE, how to work with testnets and how to setup MetaMask. The core focus however is on a huge example Smart Contract written in Solidity, showcasing various language features. While it might be hard for newcomers to work through this gigantic file, Learn X in Y minutes is definitely a good resources for intermediate developers to revisit every now and then.
- Learn X in Y minutes community