Php error

I installed QM to identify the issues with my website then I got this overview

PHP errors were triggered during an Ajax request. See your browser developer console for details.

Page Generation Time
4.0589s
1.6% of 250s limit

Peak Memory Usage
205,355,432 bytes (195.8 MB)
38.3% of 512 MB WordPress limit
19.1% of 1,024 MB server limit

Database Queries
0.3989s

SELECT: 563
SHOW: 4
DELETE: 3
UPDATE: 1
Total: 571

HTTP API Calls
0.3898s

Total: 1
Object Cache
96.0% hit rate (14,701 hits, 620 misses)

Persistent object cache plugin not in use

The Redis object cache extension for PHP is installed but is not in use by WordPress. You should install a Redis plugin.

Opcode cache
Opcode cache not in use

Speak to your web host about enabling an opcode cache such as OPcache.`

And this php error

Count Location
Component

All
Notice Constant WP_DEBUG already defined 1
wp-config.php:94
Plugin: query-monitor
Notice Function wp_enqueue_script was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, admin_enqueue_scripts, or login_enqueue_scripts hooks. This notice was triggered by the zilla handle. Please see Debugging in WordPress for more information. (This message was added in version 3.3.0.) 1
wp-includes/functions.php:5831
Plugin: zilla-payment-gateway
Notice (Suppressed) Undefined property: WC_Gateway_Zilla::$test_mode

Please I need proper guidance to resolve these. Any help is appreciated, thanks

The page I need help with: [log in to see the link]