One can create web subpages; e.g even a subpage to Joel’s master carleton webpage; or a subpage to the sys blog.
When logged in to astro sys blog,
see “Pages” on left sidebar,
and choose among submenus {All pages, Add Page}
Then copy the url of this page which is shown on bottom right of this editing session on page,
and attach it as a link into whatever webpage is to be the parent.