I maintain my grandmothers phone, which comes down mostly to just updating WhatsApp once in a while. Obviously she doesn't have a google account, so I've installed her AuroraStore.

It's a shame that there is no official way to install apps on android without a google accout[1], since it's a basic functionality, just like calls or a web browser.

[1] For obvious reasons I don't want her to download apks from the internet.