Sanitizing, Validating , and many others (Plugin)

I’m presently creating my first WordPress plugin. Just a few days in the past I submitted it to WordPress for evaluation. Sadly, the plugin was not (but) printed, as a result of I nonetheless have to shut some safety points.

I do not Know Methods to repair it

## Knowledge Have to be Sanitized, Escaped, and Validated

contador2022/wp_mvpcounter.php:240: $ua = $_SERVER[‘HTTP_USER_AGENT’];

## Variables and choices should be escaped when echo’d

contador2022/handle/admin.php:460: <?php echo $query_today;

## Generic operate/class/outline/namespace names

contador2022/wp_mvpcounter.php:12:class PostViewsStats

Thanks prematurely.