Which one is correct?
Hi, wish you help me with this.

Thanks, bro. I really appreciate it.

Thank bro. I really appreciate it.

Explain to me, please. I think the first one, though.

Question

Which one is correct?
Hi, wish you help me with this.

Thanks, bro. I really appreciate it.

Thank bro. I really appreciate it.

Explain to me, please. I think the first one, though.

Answer

You're right, it's the first one. You'd never say 'thank' by itself. It's either 'thanks' or 'thank you'. 'Thanks' is more informal, so it goes better with 'bro'.