Best easy-to-use website/software for sharing with a limited group?

I’d really appreciate some advice! I am a member of a choir and occasionally take photos at concerts etc. I am looking for a very easy-to-use website or software which would enable me to share the photos, but only with the other choir members and not the general public.

Also it would have to be very easy to use as I imagine that not everyone is highly computer literate.

Can anyone recommend anything suitable please? If you could mention any advantages or disadvantages in this context that would be very helpful indeed.

Many thanks

Phil