There is no minimum or maximum set a priori. However, it is good practice not to overdo it, so it is advisable not to go beyond two tags. On the other hand, it is possible to publish articles without tags.
Should tags be deindexed?
Not necessarily, on the contrary: the good rule suggests russian numbers not to create tags at all if they do not have a real utility. Or to generate the pages that are needed, without publishing half-empty archives that can easily become poor content (thin content) and useless for Google and users.
Does an article have to have tags?
No, while the structure of a WordPress blog is designed to have categories (even just one), tags are not essential. So if you don't have an SEO or UX strategy for managing these resources you can also avoid them. It will be easier to avoid topic overlap issues.
Risk of tag cannibalization
To create tags on a blog, just add a word/label in the specific field of the CMS. On WordPress, for example, you can generate tags conveniently from the backend that you use to create your posts . Or you can go to the specific page that is in the main sidebar.
add new tag
The simplicity with which tags are created is an illusion. That's why they are often misused, confusing them with Instagram hashtags or the title tag. So we find blogs that insert labels randomly, as if it were raining. They also throw 30 tags for articles and this often creates a problem.
Especially in terms of SEO cannibalization of keywords . Especially when the tags, obviously indexed, have the same search intent as other archives, categories, posts or pages. An example?