Astar official website
Shiden official website
White Paper
Documentation
Github repository
Astar Token Allocation
An Introductory video for beginners

What is dapps staking?
What makes Astar unique?
Why Rollups Matter for Polkadot
Token Economics

Nov 10, 2019: Testnet Launch
Nov 21, 2019: Lockdrop Introduction
May 8, 2020: Mainnet Launch
Aug 31, 2020: 2nd Lockdrop
Jan 28, 2021: Announce of a Shiden Network
Feb 9, 2021: $2.4M Round Led by Binance Labs
Feb 18, 2021: The First Successful Cross-Chain Messaging Passing (XCMP) Transaction on Polkadot Testnet
Sep 13, 2021: Announce of a Astar v2.0
Jun 29, 2021: Rebranding to Astar Network
Jul 6, 2021: Shiden wins the third auction on Kusama

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Forum
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Channel for news announcements
Twitter Astar
Twitter Shiden
Medium