Advised & he bought an old (but not knackered) drop keel Jaguar 22.
Not too expensive, dry as a bone inside, stable even with keel up, roller headsail/slab main, so he can bash/scrape/ground etc, without any major tears.
Oh, forgot, sails OK too.
As a complete beginner with reasonable common sense, you are going to make lots of cock-ups whilst learning basic boat handling, so this is one of the ways I would go for.
That's unfortunate !
I've seen several drop keel Jaguar 22's where the hull is so weak it sagged ( permanently ) all around the keel stub when ashore...
You'll notice I didn't mention Andersons; what I say about Jaguar 22 drop keelers is based on personally seeing several ashore.
As usual thread gone away a bit, but the most useful advice was "somebody else's"
Things can only get better
I don't think you are after a dinghy name, but a Mirror 10 is ideal for learning. Loads of reasons, I think we all know them.
For a GRP boat with a sleeping cabin, the only thing that matters is getting an inexpensive deal on a sound ish boat. This sort of thing:
The learner can then sell it sharpish when they know what they want. One season and you have had a good deal, any cash return is a bonus. The same kind of logic leads many drivers to run old bangers.