Wherever you see a tiny symbol of an open laptop, that means that you can play against the computer from that page. So you can find an opening (Learn>Opening) and play it from that position against the computer. You can probably do the same thing from the Explorer or the analysis board, but Openings was all I checked.
I've had Diamond for a decade now and still find it useful. Try knocking out a few dozen of the lessons and watch a few videos to make up your own mind. Or tactics, they're unlimited too. Have fun!
This is my first post and am just trying out the sample membership, having been an active “real world” chess club member but due to the wonderful pandemic now fully converted to online play!!
I want to try out and practice some of the more exotic and risky openings. Is there a better way than trying this “live”, which has trounced my ratings?
Also, any views on the best membership option- is diamond really worth it?