Speaking of which, I now have four Android apps installed on my phone, of which only one (the Aptoide store itself) works. Two are giving me errors and one (Whatapp) I have not had the courage to try yet.

It is possible I just need to install some dependencies. It would not be the first time

<tl;dr>
For about 5 years, I have been going around with two phones: a Jolla (the first one) for making calls, texting and making a hotspot and an Android phone for everything else. I decided to get a used XA2 and install Sailfish X on it, with so far rather questionable results (see above). Needless to say, I have a lot of catching up to do.
</tl;dr>