React Tip Calculator

This was a pretty fun and quick project, i've improved a lot with the frontendmentor challenges, but i still got a long path of improvement. One question i have is how do i set defaultValues react hook form as number? i know that to set a defaultValue as a string just set it to -> "", but i did not find the way to set it to number without setting its defaultValue to 0. And feel free to add suggestions or tips, i will appreciate it!