Guest Entries includes a simple Honeypot feature to help reduce spam via your front-end forms. Documentation around configuring can be seen under 'Configuration'.
Once you've enabled the Honeypot, ensure to add the field to your forms, like so:
{{ guest-entries:create collection="articles" }} <h2>Create article</h2> <input type="text" name="title"> <textarea name="content"></textarea> <input type="hidden" name="zip_code" value=""> <!-- This is my honeypot --> <button type="submit">Create</button>{{ /guest-entries:create }}