Which agile principles do you think are most important?

Agile is an often-misused as well as misunderstood term within IT, as well as the other functions that IT works with.

From my experience, implementing an agile methodology is a big cultural shift for organizations.  The biggest problem I've seen companies run into is focusing too much on the agile manifesto definition in a "pure" state (ie, capital A agile), vs. applying an "agile mindset" in people, process, and tools.

Agile is a journey, not a destination.

This biggest one is to Break a big delivery into small parts - all aspects, small but incremental success. Second is that it works on flywheel effect - works on its own and management peek is only for exception management. Third is that it is very tool dependent and not human dependent for day to day execution so one person does not become bottleneck

Frequent releases with each release delivering a value is one of the most important agile principles for me. What we need to be careful is avoid being in waterfall mode within those agile sprints. Hence learning from past sprints in form of retros is another very important aspect of agile.

Technical excellence, most superior results derive from that...

Frequent releases and ability to respond to change
Happy Customer
Delivery Excellence
Operation Excellence