Lynis prints a long, colourful report to the terminal and writes the same thing to /var/log/lynis-report.dat in a format nobody wants to read twice. This page parses that file and shows what the run actually found: the hardening index, the warnings that need attention, and the suggestions with their test IDs so you can look up what each one means.
The hardening index is a score out of 100, and it is worth saying plainly that 100 is not a target. Lynis suggests hardening for every scenario it knows about, including ones that do not apply to your server. A web host that scores in the high seventies with every warning consciously reviewed is in better shape than one that scores ninety by installing packages it does not need.
What moves the number most on a typical VPS: disabling password authentication over SSH, setting up unattended security upgrades, adding a file integrity tool, and tightening kernel parameters through sysctl. Each of those has its own page in this panel.