WordPress is an HTTP/PHP web application. The ordinary rules of HTTP and PHP apply, and work. WordPress itself uses $_POST and $_GET more times than I can count. If you want to pass information from one page to another– say from a form to a search handler– you have to use one or the other.
There are some helper functions like add_query_arg() that might be applicable but as written your question is too broad to allow for specifics.
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