Plenty of Cleric and Fighter dips take first level for the full suite of proficiencies out of the gate. (For example, 11 Storm Sorc 1 Tempest Cleric. 11 Thief 1 Fighter)

Bard dips and Rogue dips are also pretty good 1st levels for skill versatility (1 Rogue being good as you get your Expertise then too)

There's popular Monk dips as Druid/Cleric to get the WIS to AC from 1 Monk level.

Wiz dip for scroll learning (Though, depending on overall build I might take this at level 6ish to get the level 5 powerspike on the main class first, then dip Wiz for the utility)