Please Note: Individual teachers do not have to use a webpage for the starting page. They can also use the following. Just get students used to going to a consistent place to look for assignments and announcements about class meets:
Google Doc
Google Classroom Stream Page; the Stream page will always show the link to the Meet (unless the teacher has chosen to hide the link temporarily)
Google Classroom Classwork Page; teachers can post the links on the Classwork page as part of assignments or as a resource