Hey @muaawiyahtucker,
You might be using PHP 7.3 or beyond. Though that’s generally a good thing, themes and plugins might not catch up to latest PHP version just yet so please try downgrading to PHP 7.2 (if applicable).
Anyway, PHP notices won’t hurt your site so you can hide them by setting WP_DEBUG in your wp-config.php to true and then adding these extra line below it.
// Enable Debug logging to the /wp-content/debug.log file
define( 'WP_DEBUG_LOG', true );
// Disable display of errors and warnings
define( 'WP_DEBUG_DISPLAY', false );
@ini_set( 'display_errors', 0 );
For more details about debugging in WordPress, please read this documentation: https://wordpress.org/support/article/debugging-in-wordpress
Hope that helps.