If you could choose the most crucial knowledge/courses/certifications for an admin, what would they be?

I started working as the admin at the local uu church at the beginning of the year. I LOVE the job. I'm in charge of accounting, email campaigns and newsletters, building and grounds, contractors, assisting with grant management, rentals, etc.,

However, I came into this job pretty light on professional experience. I have learned SO MUCH on the go and through pure problem solving.

In the next year, I will be offered some staff development opportunities. I think it's most important to do a basic bookkeeping course of some kind just to reaffirm everything I've learned and fill in any blind spots. What else should be on my radar? What would help me most in my job and to fill out my knowledge/skillset?

I want to make the most of this opportunity, both so I can be a great asset to the church and for my own professional development.

And if you can think of a better place to ask, lemme know! I couldn't find an active nonprofit admin reddit.