Official site https://polkadot.network/
Wiki https://wiki.polkadot.network/
FAQ https://polkadot.network/faq/
Support https://support.polkadot.network/support/home
Whitepaper https://polkadot.network/PolkaDotPaper.pdf
Twitter https://twitter.com/Polkadot
Medium https://medium.com/polkadot-network
Youtube https://www.youtube.com/@PolkadotNetwork
Telegram https://t.me/PolkadotOfficial
Reddit https://www.reddit.com/r/polkadot/
Discord https://polkadot-discord.w3f.tools/
Github
Current price and history https://dropstab.com/coins/polkadot
Exchanges where DOT is traded https://dropstab.com/coins/polkadot/exchanges