"Did we make it" is basically answering the question "did we meet our sprint goals"?
In our team we have two types of sprint goals. The first is a group of epics, a subset of our planned sprint work, that we marked as the most valuable to moving our product forward. If we have 5 epics planned for this sprint, we typically mark two of them as Sprint Goals. This goal is fairly objective; whether we finished the sprint goal epics is pretty much evident.
The second sprint goal is to end the sprint with a stable, releasable product iteration. If we finished all our epics and stories for the sprint but ended up with a product that is less usable and less stable than before, the sprint is considered to be a failure. This is somewhat more subjective, and we try to be honest regarding how we feel about the stability of the product at the end of the sprint.
"Felt right / Didn't feel right" is an open invitation for people to share what made them enjoy their work this sprint, and what detracted from their enjoyment. There is no need to go into or solve every issue that is brought up. The idea is to warm up people to participate and to prepare the grounds for looking at the process and seeing if it needs adjustments according to how people felt this sprint.
The real heart of the Retrospective is the Process review. This is where the actionable items are generated . In "thing we want to try", we put down changes to the process that we want to pilot in the upcoming sprint.
In "Thing we tried and want to keep" we put changes that were piloted and proved themselves.
In "Thing we tried and want to throw away" we put process components that we don't want anymore. They usually come from "Thing we want to try" or from "Things we tried and want to keep", but not necessarily.
Over time, the "Things we tried and want to keep" column becomes an overview of the team's current process.
Finally, "Action items" is for assigning process related tasks to an individual. These tasks are usually an exploration into a process change we want to implement but need more information regarding technical or organizational difficulties.
Here's an example of a filled template from an actual retrospective with my team: