Does anyone know about EU Settled Status/naturalisation...

[EssentialHummus]

... and can you explain it to me in small words, please?

I don't know where to start/what I need to do.

Been in the UK for 11 years now.
Initially on a non-EU passport, student visa (Tier 4), then Tier 2 for work.
In 2012 I acquired “ancestral” EU citizenship and now hold that citizenship and passport.
DH is naturalised British, DD was born here and is British.

What do I need to do to ensure (well, not “ensure”, no one knows, but...) my rights post-Brexit/get onto the path towards citizenship?

You need to apply for settled status, then you can start the process of citizenship.

You have nothing to worry about.

You do it online, it's fine, I have just helped my dad with it. You need your passport number and you have to upload a photo.