There are some really good tips on delivery and best practice, in summary:

Speed comes from making the safe thing easy, not from being brave about doing dangerous things.

Fast teams have:

• Feature flags so they can turn things off instantly
• Monitoring that actually tells them when something’s wrong
• Rollback procedures they’ve practiced
• Small changes that are easy to understand when they break

Slow teams are stuck because every deploy feels risky. And it is risky, because they don’t have the safety nets.