About r/ethdev
Ethereum Development and DApps
Ethereum-related dev talk: Contracts, DApps, Wallets, Clients, Infrastructure, Tooling, UIs, Patterns, and others.
Ethereum Development and DApps
No specific rules are enforced apart from the normal global reddit rules. That said, if you post scams, you will be banned.
Other subreddits
r/ethereum - Official Ethereum sub
r/ethstaker - About staking your ETH: help and guidance
Also Potentially Useful
http://ethereum.stackexchange.com/ - The Ethereum Programming Stack Exchange