I have to make a decission but dont know what is best, I was reading the google guidelines for multilanguages and it just made it worse.

I was checking my site that has on the same url two languages and there is no hreflang anywhere. So, how can google crawl both pages? It will index/ crawl just one version?

Then i tried to check to use different urls for the languages but i faced problems with some plugins like the blog plugin.

What do you people use / suggest? If we use same url for many languages, dont we have somehow to let google know and index?

i read everywhere that hreflang is a must for sites using many versions / languages on same urls

the more i read about it, they need to be on different url, so lets continue here pls: https://forums.osclasspoint.com/blog-and-news-plugin/indeed-blog-plugin-is-incompatibility-with-language-code-into-base-url/new/#new

You could probably should be able to create code to generate herflangs to header.
<link rel=”canonical” href=”https://www.test.com/cz/” />
<link rel=”alternate” hreflang=”en-us” href=”https://www.test.com/en/” />
<link rel=”alternate” hreflang=”de-de” href=”https://www.test.com/de/” />
<link rel=”alternate” hreflang=”sk-sk” href=”https://www.test.com/sk/” />
But may need quite a lot of testing. There is piece in subdomain generator for languages. But you can also get all enabled locales and udpate current link and identify canonical one.