recently i found out that i can’t visit some websites. i used different browsers, but i get an error everywhere. the problem is not in my hardware, because from the same device but a different operating system i can visit these sites without problems. the system is absolutely clean. who is interested in these sites: codewars.com, stackoverflow.com, leetcode.com and other.
Hi fndpc,
Welcome to Fedora
Can you run
inxi -Fzxx
and post the output here using ‘preformatted text’ which is the </> button in the toolbar of the reply window,
If you want to talk about the sites linked, you would be better to ask in the watercooler offtopic area of the site.
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It would be helpful if you told us what the error is. 
I can think of a number of causes: name resolution issues, HTTP errors from the server (for whatever reason), or issues with TLS. But that is all speculation without more info about what the errors are.
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My guess is that systemd-resolved isn’t playing well with your ISP’s DNS servers. I have a similar problem with my ISP. One thing you might try is setting DNS to servers that can support it in your network settings:
It’s also possible to disable systemd-resolved and revert back to the older NetworkManager /etc/resolv.conf config.
Could be a difference between IPv4 and IPv6 either on DNS or with the router’s DHCP settings, which would account for different websites having different behaviour. (Like in this thread: Issue: Certain Websites (Twitter, Reddit) Not Loading While Others (YouTube, Google) Work Fine)
