I've been generally quite pleased with the work coming from the US Cybersecurity & Infrastructure Security Agency (CISA); they've produced some really good informational products and coordinated some really good information among other agencies. This Ransomware Fact Sheet from the National Cyber Investigative Joint Task Force (NCIJTF) is a great one-stop quick reference to ransomware.
Additionally, this CISA ransomware web page has a wealth of ransomware information.
Castle Labs sincerely hopes that your business never gets hit with ransomware. It's a true scourge on business operations, especially those of small & micro businesses. We are here to help; please reach out and contact us for an assessment of your business' risk and guidance on how to reduce it.