Which information should I NOT give out because it will enable someone to retrieve my coins? The seed, obviously, I got that. But what about the "coin address" and "Tx id"? Can I give it out if someone offers to help me and asks for it? Or would that be really stupid?
Aside from the seed, you shouldn't give the addresses' private keys and your wallet's master private key if you exported it.
The wallet's master public key shouldn't be shared either even though it's impossible to generate the private keys using it.
The addresses and TXID when publicly displayed will only have privacy issues.