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Spencer,

One problem we had with our yahoo groups is that all discussion
threads ended up one large group, and there was no good way to ignore
threads that you were not interested in.

As Duane and Toby mentioned, Groups.io has better tools for members to ignore uninteresting threads, or follow only certain threads. That's described in the Help page sections that Duane cited. This can often replace or reduce the need for the rigid partitioning available using the subgroups feature.

I want to setup the new groups.io group so that everyone is
automatically subscribed to an ANNOUNCEMENTS and a NEWSLETTER group,

There's no feature to have a member automatically subscribed to any subgroups.

What I would suggest is that you make the primary group contain both announcements and newsletters, since you want everyone to automatically start with those, and then use #newsletter and #announcement as hashtags to mark those kinds of messages. That will allow members to mute either if they no longer wish to receive that type.

but they are free to ignore all other groups such as GENERAL
DISCUSSION, EQUIPMENT, BUY-TRADE, etc.

You could make the primary group also the place for general discussion - that would be all topics not hashtagged as either #newsletter or #announcement - but that would only be advantageous if you think most (or nearly all) members would want to receive general discussion topics. As John said that's seems more typical of how Groups.io groups are run.

For the other categories of messages you can choose between rigidly separating them into a subgroup (Buy-Trade seems like it may be a good candidate for that) or marked by a hashtag. There are plus and minuses to either choice, and neither choice wholly eliminates the problem of members posting to the wrong subgroup or using the wrong hashtag (or failing to use the right one).

How can I keep everyone from posting to MAIN as a default? We will
have some subscribers who are only interested in seeing announcements
and the newsletter and won't care about anything else, ...

If only a small minority of subscribers have such a narrow desire you can put the onus on them to set up their subscription that way: they should use the advanced preferences to select Following Only and then follow only #newsletter and #announcement.

If you think that there will be more than a few who feel that way you could go ahead and make General Discussion a subgroup. Then in the primary group's Settings, Spam Control section, you can put a check in the "Announcement Group" box so that only moderators may post into the primary group, and it is used only for announcements and newsletters.

Shal


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