Ouch.

If you can help even one person avoid ever having this happen, then you're doing the right thing. Educate others.

I recently reconnected with a friend from high school that I haven't spoken to in many years. He wanted to get started with bitcoin. He said he had already purchased some from Coinbase, but it's just on their server where he bought it. He has never used a wallet yet.

Here's a screenshot of the last of the stuff I told him: