Tubes/trains from Watford to Victoria

[mygrandchildrenrock]

I hope some kind person can help. I'm staying in Watford tonight and going to the Victoria Palace theatre tomorrow.
I don't know London at all and am not very confident on tubes.
Having said that I probably need to get one or more tomorrow! Does anyone know what the best way to get from Watford to the theatre is please? I have googled but got conflicting advice and the hotel staff don't know either.
Thanks in advance.

I'd probably do metropolitan line from Watford to kings cross , then Victoria line kings cross to Victoria . It's opposite Victoria station so should be easy enough

Depends where you are. Could also do Overground to Euston then Victoria line to Victoria Station.