Links don't work. (from local to live)

Contact your hosting company. The webserver root does not have the WordPress files; either you put them somewhere else or your web host hasn’t setup your account yet.

sorry I guess i made something wrong when I changed to URL before uploading. try https://le-fix.com

Same landing page when I leave out the www.

Assuming the page works for you and the links are not working, try reseting your permalinks.

https://your-blog-url/wp-admin/options-permalink.php

From that page, just save your options. If you have mod_rewrite enabled, that may fix your problem.

thanks, I will try that. I might get back to you if I get lost.

Do You know where I can change the site’ URL (php)?

Sure, it’s https://your-blog-url/wp-admin/options-permalink.php.

Give this a read if you get stuck.

https://codex.www.ads-software.com/Changing_The_Site_URL