The Conventional Commits convention for commit messages — the format and what it buys you, checking messages with commitlint and lefthook at commit time, and checking them in CI
Jujutsu (jj), the Git-compatible version control system — installing it, how it differs from Git, and the commands you type every day
Sapling (sl), Meta's Git-compatible VCS — installing it, stacks, one PR per commit with sl pr submit, ReviewStack, and the sl web GUI