Linking keywords to their corresponding link each time the keyword is used in an article is a hassle. here is the best way to set which keyword get linked to which link and every time the keyword will be used in any post, it will be automatically linked to the corresponding link automatically.

1- Install this plugin named “SEO Smart Links” from here https://wordpress.org/plugins/seo-automatic-links/

2- Visit the plugin tab named “Custom keywords” and add the keyword|URL combinations where the keyword will be replaced by the URL

3- Done