What a new user needs to know after installing OpenMandriva?

[rugyada]

@ycom1

I mean if one chose rolling, I think that after an update you could not downgrade to stable, or if you took cooker you would not go back to rolling

It is called ‘Update Channel’

Yes, you can switch to a different older Update Channel but only for a few time when the 2 branches get sync-ed such as at time of copy cooker to rolling (usually new installation images releases or major upgrades), or rolling to rock (stable point releases published).

Example: How to downgrade ROME TP to true ROME rolling release

Both events are promptly announced.
In particular ROME major upgrade expected here.