Parity's "Substrate Builders Program" aims to educate and help developers building solutions on top of the Substrate software stack.
The program is divided into three tracks:
<ol>
<li>Chains Track - For developers building custom Blockchains.</li>
<li>Infrastructure Track - For developers building Substrate / Polkadot-related infrastructure.</li>
<li>Application Track - For developers building applications on top of Substrate-based chains</li>
</ol>

Official program to help Substrate builders take their projects to the next level.

Substrate Builders Program

The official Substrate documentation is one of the first places every Substrate developer should visit. On it you'll find <a href="https://docs.substrate.io/tutorials">tutorials</a> and resources to learn about the underlying <a href="https://substrate.io/technology">technology</a>.

Official Substrate development resources.

Substrate Documentation

The official "Substrate Marketplace" lets you browser and discover reusable Substrate Runtimes, Pallets and Projects.

Marketplace for reusable Substrate libraries and tools.

Substrate Marketplace

With "Substrate Playgrounds" you can easily spin up cloud-based development environments to test out different ideas involving the Substrate Blockchain framework.
There are 2 template one can use:
<ol>
<li>Node Template - A "Skeleton Blockchain" with essential capabilities like P2P Networking, Consensus, etc.</li>
<li>Front-End Template - A modular UI based in React.js to interact with Substrate-based Blockchains</li>
</ol>

Cloud-based development environment to play around with the Substrate software stack.