Penetration tests

[epsilon0112358]

Are we talking about hardening a Kali Linux machine here?
If so, this conversation seems somewhat relevant:

Risks of Using Kali Linux as a Primary Desktop OS

Perfectly usable as an everyday distro. Whilst there are some things in this list I may not bother with myself, this will give you an idea of things you may want to think about;

If you mean something else, please elaborate on your setup, your goal…