Starttags

I’ve have three items in my spam that refer to “start tags” which arrived as comments. The addresses are

starttags.com/tags/url-text
starttags.com/tags/photos-du-ciel
starttags.com/tags/colour-composition

My blog is https://www.coppercoastworkshops.com/minimalistics/ I’m pretty sure that they are harmless and probably useful, but I’m uncertain.

Does anyone know what they are about and advise in simple terms whether I should approve them and add them into comments – or delete them. Thank you…..George