With the recent windows 10 EoL news, I was able to move my dad over to Linux mint. But he does a lot of finance stuff. Long ago, Linux had a belief that desktop Linux are not the primary target for crackers but I don’t believe that true anymore since it’s getting significantly popular lately like Europe government migration over to Linux and Libreoffice.

My question would be , given my dad is just as careful on Linux as he has been on windows, would it be fine to do finance like banking and trading (not the fastest kind )?

If not, what would be your distro of choice for that? Even browsers (I installed Firefox and Edge from Microsoft website deb file)