EarMaster

For a general guide on how to make ssh more secure I stick to https://www.sshaudit.com/

You can check your config and they also provide step by step guides for several distros…

As far as I know that’s not possible for WhatsApp.

I use INWX (based in Germany). Prices are consistently low (not always the cheapest, but fair). The web UI is a bit rusty, but it works perfectly and you can manage everything there.

That show is equal parts content and advertising. That is a bit too much for me…