How to get rid of spam on website forever?

are you referring to SPAM comments?
look into something like https://akismet.com/

Here’s another reference that might help:
https://www.wpbeginner.com/beginners-guide/vital-tips-and-tools-to-combat-comment-spam-in-wordpress/

Hi @developerdesigns22,

I am thinking about this too, my site have 7000 registered users now, but actually only a few users ever really submit real comment or come back, I using akimet so it is great to stop many comments, but it did not stop spam bot register as a “user”, it caused me waste many hours on these spam, I don’t like waste time, I am thing how can we detect these spam, I guess, at first, when users register, they must pass the random questions, and them when they submit content, they must pass the random questions, also I believe we need check mails, if from some mail address they never have real comment or posts, we will sent mail notification for let them go back our site, if a few days later, they do not come back my sites, I will “delete” they account and give mail address lists in back end with checkbox, so I can click mail address and stop similar mail box register as a user, for example, if there are too many users from abc.com but never have real comment, I will stop any register from abc.com, do you think is this good idea? Any more rules do you think is helpful? I am developing a plugin to do this so I do not need to search them in admin user list and delete them manually.

Of course, another method to stop spam, is build a members only site, but by this way, it is not good for SEO, right?

Best Regards,
Tomas

Might have a look at Anti-spam — WordPress Plugins which I’ve been using for some time and it stops 99.9% of spam (especially from bots) before Akismet even needs to check it to possibly send it to the spam folder.

I like it because from a normal user’s perspective, the comment form looks the same.

In my humble experience, there are techniques built into WordPress that make Spam comments very much a non-issue:

A) Moderate all comments: Admin Dashboard>Settings>Discussion>Before a comment appears>An administrator must always approve the comment

B) To place all comments with (spam) links into spam comments: Admin Dashboard>Settings>Discussion>Comment Moderation>Hold a comment in the queue if it contains> 1 >or more links. (A common characteristic of comment spam is a large number of hyperlinks.)

C) Then: Admin Dashboard>Settings>Discussion>Comment Blacklist> Add to this list:
www
http
url
ftp
sex
viagra
drug
your terms

D) Admin Dashboard>Settings>Discussion>Other comment settings>Automatically close comments on articles older than>14>days
(Leaving comments open for a long time will have the biggest impact on how many spam comments are received)

E) Admin Dashboard>Settings>Discussion>E-mail me whenever>A comment is held for moderation>Comments sent to spam are not emailed.

F) Update the comments form to note that comments are moderated, links not allowed, and language must be about the post/page.

G) Empty the Comment Spam daily (often)>Check all>Delete Permanently.
You can now rest assured that some bot is not going to flood your site with bad links.

As you can see, we can use the built in features in WordPress to control comment spam.

• This reply was modified 7 years, 11 months ago by Pioneer Web Design. Reason: clarity

– We have a few recommendations at https://codex.www.ads-software.com/Combating_Comment_Spam
– consider a plugin like https://www.ads-software.com/plugins/akismet/ or https://www.ads-software.com/plugins/stop-spammer-registrations-plugin/
– Also, harden WP: https://codex.www.ads-software.com/Hardening_WordPress

try wp clean talk pro version takes care of most if not ALL