Ask HN: What admin services/platforms do you recommend for new small businesses?

I'm happy that my company is growing! I'm doing my best to keep the administrative part of the business synced and simple. But it seems like there are so many options to pick from. So I thought it'd be cool to hear about your experiences, if you're working/have worked in the small business space. What have you found useful, functional, and/or frictionless?