How to protect the form landing page from spam?

Question

Fight against spam

Everyone knows that on the landing page you need to use as few fields as possible and therefore captcha is not very suitable for LP, are there any ways to protect against spam besides captcha?

Answer 1

If not a captcha, then everything should be checked in the back-end: posting ip, browser fingerprint, referer, etc.
And cut off the abusers.