Swarm home page; http://swarm-gateways.net/bzz:/theswarm.eth/
Read the docs; https://swarm-guide.readthedocs.io/en/latest/index.html
Swarm developer’s onboarding guide; https://github.com/ethersphere/swarm/wiki/swarm
The swarm engine room; https://gitter.im/ethersphere/orange-lounge
Similarities/differences between Ethereum’s Swarm and IPFS; https://github.com/ethersphere/go-ethereum/wiki/IPFS-&-SWARM