For a common understanding of sharding technology and QuarkChain design. CEO Qi Zhou has published articles.

• QuarkChain Explained, Part 1: Brief Introduction of Blockchain Scalability and QuarkChain
• QuarkChain Explained, Part 2: Sharding — Brief Introduction and Challenges in Blockchain
• QuarkChain Explained, Part 3: Sharding in QuarkChain — State Partitioning
• Supporting Multi-Native-Tokens in a Single Blockchain
• QuarkChain Explained, Part 4: Sharding in QuarkChain: Consensus
• Order-Statistics-Based Hash Algorithm
• Proof of Staked Work — A Simple PoW/PoS Hybrid Consensus
• Slash in Proof of Staked Work with Example to ETC 51% Attack
• QuarkChain Explained, Part 5: Collaborative Mining and Hashpower Reuse Technique
• QuarkChain Explained, Part 6: Cross-Shard Transaction
• Fixed-Supply Token Model With Dynamically-Added Shards/Chains

Read them if you have any questions we can discuss them here.