ok, we stay in the beta track. What if I want to get off the beta track when 18.1 comes out, how do I get off and install iOS 18.1?
Betas, public or developer, carry some risk with them. Most of the time, it's just minor annoyances. Occasionally, they can cause your phone to malfunction in some way or even brick it. Fortunately, even in these extreme cases, the phone can be restored via a reinstallation of the software or at the Apple store (in the most extreme cases).
If you install a beta, the most important thing you can do is save an
ARCHIVED backup of your phone while it is still on the "old" software (the one you are moving from) on your Mac. The backup needs to be
archived (meaning saved with a specific name and in a specific location) because if it is not, your next backup on the new (beta) software will overwrite the backup you made while still on the old software. If that happens, you will not be able to restore your phone to the old software if there is a problem on the beta.
Do this (archive the backup) and you will be just fine.
Google archiving backups. There should be some articles on Macrumors about this and on iMore (if those are still available).
Regarding getting off the beta track: its as simple as toggling the switch in Settings>General>Sofware Updates>Beta Updates to "Off". You'll stay on the beta your on in that case until the next general release comes out and then you will automatically be moved to that when you update.