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Why are the installation instructions aimed towards Linux?
(sh.itjust.works)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Asking "is it safe to use" is pointless. No one can say an app is "safe", just that they've never seen an issue.
I'd argue Termux isn't safe, because if you're rooted you can break the OS. And I use Termux every day.
"Safe" is determined by your use-case and what you do. I'd even argue there's no such thing as "safe", just a risk level which you are comfortable with.