geraniums

This is news to me. My geraniums stay in the ground. I have too many to put in the shed. Much too big for indoors.

I leave mine in the ground, let 'em die, and start again next year.

My good gardening days are past. Easy way only for me now.

Yes, if mine don't survive I plant more but most of them bloom and expand for a few years.
I could never start potting them up.

I cut mine back, pot them up and keep in an unheated greenhouse, water very sparingly. If a heavy frost is forecast I cover them with gardening "fleece" over night & uncover again in the morning. All survived last year.
In previous years I did the same but kept them in the conservatory. I am in the South East - so reasonably warm.

I wish everyone would specify whether they are referring to pelargoniums (which is what I believe tho OP is asking about) or geraniums.
Geraniums are completely hardy. They die back but in spring always sprout again. You might know them as cranesbill as the seed head is rather bird like.
Pelargoniums (which some people wrongly call geraniums) usually need protection and only survive the winter outside in very mild areas. Any touch of frost destroys them. All of the recommendations above from Gransnetters should give reasonable success. The key is good drainage, little water in the winter and protection from frost.

I think we can take it that it is perlagoniums that are being referred to.