Antispam on custom forms

Replies: 3

Hi! I use separate html page for subscription purposes with its custom form (non-built by WordPress or its plugins). And recently it is being attacked by spam robot, adding false e-mail addresses and compromising my mailing in Google Mail. So I try to implement spam protection on it using this tip – https://dineshkarki.com.np/add-wp-armour-support-for-your-custom-forms.html But I’m not strong in coding and wonder which code can I add instead of the line:

// YOUR CODE TO BLOCK SUBMISSION

Is there a default solution or more detailed guide for dummies?