php mysql out put data

When you run a query there are many potential actions you can take once it is complete. For instance - get a row which you may want as an object or an associative array. You may want to know how many rows were affected.

The $result variable is an instance of the mysqli_result class (as Dave pointed out) that gives access to the various functions you may want to perform on the result set.

As a value on its own it is only really usable on failure when it will be set to false or when the query() does not return data in which case it will be true.

If you are expecting data to be returned from the query you can do this

$result = $mysqli->query($query);
if ($result) {
   // query was successful so process result here
}
else {
   // report error
}

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+1 for Dave's recommendation to look up the examples in the documentation.  PHP is a living language, and there are features being added to it all the time.  If you read the man pages, you'll find out about these features and you'll see examples of how to use them.  I could not write code without having a window open to the online documentation at http://php.net!

Many examples of MySQL, MySQLi, and PDO are available here, with the scripts built in parallel construction so you can see how each extension accomplishes the same tasks.  In these examples I named the results variable $res.
https://www.experts-exchange.com/articles/11177/PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html

As a general rule, var_dump() is your friend.  It will not always expose everything about a variable (some things like SimpleXML_Element and PHP "resources" are hidden), but for any initial exploration, the first thing to do is use var_dump() and see what's in the variable.  There are examples in the article showing how to use var_dump() to visualize the results variable.

MySQL is a complicated thing, with a history that is sometimes nonlinear.  Information you need to provide or retrieve is often scattered across different objects.  Sometimes it's useful to look at the MySQLi object, and other times a statement or results object contains what you want.  The man pages, and var_dump(), can help you discern what is where.