I don’t know if I wrote it correctly the first time. What I meant was that I have a Polish site and I would like to make an English/French version. What do you recommend using?
In this case, you can upload the translation (https://xtemos.com/docs-topic/theme-translation/) to the site. However, those translations are not complete, so untranslated fields you can change through the Loco Translate plugin.
I understand, but do you have any proven way to make my website bilingual? I would like to have a choice of language options, like on your demo on the left at the top, e.g. flags, if I click the PL flag I have a website in Polish (original), if I click the English flag I have a page e.g. xxxxxx.pl/en and I have everything in English, most of the translations are done manually.