Most breaches don't come from sophisticated attacks, they come from missing fundamentals. Here are five that make the biggest difference for the least effort.
First, turn on multi-factor authentication everywhere it's offered. It's the single highest-impact control you can deploy. Second, keep everything patched; unpatched software is the most common way in.
Third, back up your data and test that you can actually restore it. Fourth, train your team to spot phishing. They must understand that people are the real perimeter. Fifth, use a modern endpoint protection tool that can detect and respond, not just scan.