The best way to learn Cadence / Flow in video format.
The (far inferior but) official Flow YouTube channel.
Mess around with Cadence code in a browser emulator.
Install the Flow CLI.
Official link to all documentation related to Flow & Cadence.
Receive syntax highlighting and live compile erorrs.
Block explorer.
Browse contract code, account, and key information.
Discover contracts.
Explore Flow account information.
Very organized & clear threads on Flow.