confusion about quarterly taxes

I thought I had everything squared away to withhold taxes from our nanny and felt like it made sense but then I saw that we need to file taxes quarterly? or just report something? can someone explain this better and what it entails. We only just hired our nanny this year January 2025. I am aware some websites do it for you but those are extra expenses hence why I am trying to do it myself and also learn so I am aware of what everything is. thank you!