Summary for ch4

modules/ch4-update/pages/s5-summary.adoc

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+= Summary
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+In this chapter, you learned:
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+* No matter how you provision your edge devices, they need access to remote OSTree repositories to fetch system updates.
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+* Edge commit imagge used for system updates must be created with a reference to an existing OSTree repository and an OSTree branch with at least one commit.
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+* Devices provisioned using edge installer images are *NOT* configured with an OSTree remote, you must configure it before applying updates.
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+* RPM-OSTree stages upgrades on the system disk, as a new OSTree commit, and applies then on the next boot. It also keeps the previous OSTree commit so you can rollback from the upgrade.
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+* Changes to files in `/etc` and `/var` are retained during system updates and rollbacks.
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+* OSTree static deltas between two OSTree commits make system upgrades faster and more reliable for devices with high latency or low-bandwidth network connections, and most be created manually.
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+* Everyime you add commits or static deltas to an OSTree repository, you must update its summary file.