Can I convert only the first occurrences of a keyword to automatic internal links?

Yes, with the Limit option of the AIL you can set the number of occurrences of a keyword that should be converted to automatic internal links.

For example, if you want to create an AIL that converts only the first two occurrences of the keyword “book” you can set “2” in the Limit option.

With this AIL only the first two occurrences of the keyword “book” will be converted to a link

You can find other methods to limit the application of the automatic internal links in this FAQ.