For information on setting up or using Gold, see these docs.
For an architectural overview, see: https://docs.google.com/document/d/1U7eBzYrZCPx24Lp9JH2scKj3G8Gr8GRtQJZRhdigyRQ/edit
To run Gold locally, see: https://skia.googlesource.com/infra-internal/+show/c6fad0bec78c6768ce7e4187606325216dd438ed/scripts/start-gold-chrome-gpu.sh
Gold uses CockroachDB to store all data necessary for running the backend servers. (Caveat: We are in the middle of a migration towards this goal.)
For production-specific advice, see docs/PROD.md.