Pick a service and a distribution. Get the install, enable, firewall, config and verification commands that actually apply to that distribution — and see which of them we ran ourselves.
The unit name is not the package name. apt install samba gives
you a service called smbd; dnf install samba gives you one called
smb. Redis is redis-server on Debian and redis on
RHEL. Chrony is chrony on one and chronyd on the other. None of
that is guessable, and it is where a copied guide silently fails.
There is no shortage of “how to install X on Y” pages. What is scarce is any statement of which commands were run and which were typed from memory, and how old they are. Package names change, units get renamed, config paths move between releases — and a page from 2019 looks exactly like a page from last week.
So this tool does one thing differently: every step is labelled. A build script installs each package on a real machine, checks that the unit file we name exists and that the config path we name is there, and writes the results to a file the page reads. Nothing here is marked as checked because an author felt confident about it.
The honest limits are stated on every result, not buried: the machine that runs the checks is Ubuntu, so RHEL, SUSE and FreeBSD steps come from each project’s own documentation and are labelled that way.
The long version is written up on the blog: The same install guide fails on your distro, and never says why — what actually differs between distributions, and why a guide that worked for somebody else leaves you with a service that will not start.