advice for partner while in labor

BabyK`sMom • IVF miracle born 4/20/17 x2 sweet angel babies 🖤👼🏻👼🏻 🌈 due 3/31/20
My hubby wants to know.. what advice would you all give to a partner in order to support a momma in labor? Is there something your partner did/said that was super helpful? Things you wish they would have done? Things NOT to do? Even if you are a FTM, I'm curious what guidance you have given your partner in preparation for delivery!