How to avoid wordpress spam without spending anything

I would like to know how to avoid the amount of spam that comes in wordpress comments, either through some plugin (free of preference) or through wordpress configuration.

Akismet solves the problem very well.

link

It has a free plan.

ALTERNATIVES

Through Plugin:
Spam Comments Cleaner: link

Through PhpMyAdmin:

You can do this in PhpMyAdmin with a query:

DELETE from wp_comments WHERE comment_approved =  '0'

DELETE from wp_comments WHERE comment_approved =  '1'

DELETE from wp_comments WHERE comment_approved = 'spam'

DELETE from wp_comments WHERE comment_approved = 'trash'

This will delete all approved comments – see if this is the current wp_ prefix of the database table and remember to backup your database first.

source: link