Trying to help my dad invest extra money he’s saved throughout the years.

Hello everyone, my dad has saved up a pretty decent amount of money as a carpenter throughout his life, upwards of 50k. He’s looking to retire within the next 10 to 15 years max. He has a pension so that when he retires he could basically live off that. That said, he’s asked me what I think he should do with the extra money he’s saved up.

I’m no investment expert aside from the little I’ve tinkered with on robinhood, coinbase, ect. I said I would get back to him once I’ve researched a little more. I’d love to get your recommendations on safe investments, high risk high rewards, etc. I appreciate any advice!! Thank you!