Several languages on the same site

I have this website for a vacation resort that I want to make in WordPress.

I do not know PHP, I usually download a blank theme from the internet and only style it. I did this a few times before, so I am quite good at it. But it still doesn’t mean I know any PHP.

Now I want this website to be in multiple languages (not automatic translation, but human translation). And there are five languages in total I have translation for. How do I do that? Don’t get me wrong – I don’t want a plugin to translate my posts. I want to have the site in five different languages (with different menu language and so on – like 5 different sites only with the same theme).

Is there a plugin that can help me? Or do I need to install WordPress 5 times in different subfolders – although this seems too complicated, there must be another solution?