[//]:content-type-MARKDOWN-DONOT-DELETE Gate Learn has released 11 new articles this week ! As the Ethereum Layer2 Arbitrum completed Airdrop, the ecosystem got market's attention, with a corresponding increase in TVL. In [Deep Dive Into Arbitrum](https://www.gate.io/learn/articles/a-deep-dive-into-arbitrum/487 "Deep Dive Into Arbitrum"), we'll explain its scalability solutions: Arbitrum One & Nova, ecosystem development, and roadmaps. Projects we covered this week : [stablecoin project Fei USD](https://www.gate.io/learn/articles/what-is-fei-usd/485 "stablecoin project Fei USD"), which has been shut down, [lending protocol TrueFi (TRU)](https://www.gate.io/learn/articles/what-is-truefi/477 "lending protocol TrueFi (TRU)"), which has received renewed attention due to its stablecoin TUSD. Additionally, there is [SingularityNET $AGIX](https://www.gate.io/learn/articles/what-is-singularitynet/483 "SingularityNET $AGIX"), which has gained popularity due to the AI craze, and the [NFT blue-chip, Doodles](https://www.gate.io/learn/articles/what-is-doodles-nft/486 "NFT blue-chip, Doodles"). [A comprehensive guide to crypto derivatives](https://www.gate.io/learn/articles/crypto-derivatives-explained/480 "A comprehensive guide to crypto derivatives") will introduce you to perp, swaps contracts, options, and other crypto derivatives. [GPU mining and a Mining Rig](https://www.gate.io/learn/articles/what-is-gpu-mining-and-a-mining-rig/484 "GPU mining and a Mining Rig") will give you the background of its origin and growth, and current scenario.