I’d point a new owner to the IRS Small Business and Self-Employed Tax Center...

https://travissqky968.huicopper.com/quickbooks-vs-other-accounting-tools-what-should-i-use

I’d point a new owner to the IRS Small Business and Self-Employed Tax Center before their first tax deadline. It gathers guidance on estimated taxes, recordkeeping, and hiring in one place, and you can use it without signing up